FBI investigators are expected to continue their search of a San Bernardino lake and surrounding areas Friday looking for electronics and other items left by the shooters in the most deadly terrorist attack on U.S. soil since 9/11.
FBI agents will probably spend days searching Seccombe Lake and canvassing the neighborhood for clues after receiving a tip that the pair may have visited the area on the day of the attack, according to David Bowdich, assistant special agent in charge of the FBI’s Los Angeles field office.
Meanwhile, more details emerged about the investigation into married couple Syed Rizwan Farook and Tashfeen Malik.
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Two congressmen, after receiving an intelligence briefing Thursday, said neighbors of the shooters told investigators they witnessed “suspicious activity” at the couple’s home before the attack but did not report it to authorities.
They didn’t provide details about what those activities were. It’s also unclear what home the officials were talking about. The couple, authorities say, amassed a cache of weapons, ammunition and explosives at their home in Redlands.
The FBI has searched another home linked to the family in Corona. At that location, several neighbors said they saw the residents moving large boxes and furniture out and into SUVs a week before the shooting.
An examination of digital equipment recovered from the home of the couple who killed 14 people in San Bernardino last week has led FBI investigators to believe the shooters were planning an even larger assault, according to federal government sources.
Farook and Malik were in the final planning stages of an assault on a location or building that housed a lot more people than their Dec. 2 attack site, the Inland Regional Center, possibly a nearby school or college, according to federal sources familiar with the widening investigation.
Investigators have based that conclusion on evidence left behind on Farook and Malik’s computers and digital devices, not all of which the couple were able to destroy before they were killed in a firefight with police hours after their rampage, the sources said.
Images of San Bernardino-area schools were found on a cellphone belonging to Farook, according to a law enforcement source. But the source cautioned that Farook may have had a legitimate reason to have the images because his work as a county health inspector involved checking on school dining facilities.
On Thursday, one of the federal government sources told The Times that in 2011 or 2012 Farook asked his friend and neighbor, Enrique Marquez, to buy two military-style rifles used in the attacks because he feared he “wouldn’t pass a background check” if he attempted to acquire the weapons on his own. The rifles were bought at a local gun store, the source said.
The timing of the rifle purchases is significant to FBI investigators. Another federal government source previously told The Times that Farook may have been considering a separate terror plot in 2011 or 2012.
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Friends and relatives of Sierra Clayborn gather for her funeral at Mt. Moriah Missionary Baptist Church in South Los Angeles.
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A memorial service was held for Nicholas Thalasinos on Saturday morning at the Shiloh Messianic Congregation in Calimesa.
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A Shabbat service was part of the memorial for Nicholas Thalasinos at Shiloh Messianic Congregation in Calimesa, where Thalasinos and his wife, Jennifer, were integral parts of the congregation.
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A hired mover carries out personal items from the home of San Bernardino shooters Syed Rizwan Farook and Tashfeen Malik.
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Residents turn out to greet President Obama’s motorcade in San Bernardino.
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President Obama and First Lady Michelle Obama greet San Bernardino Mayor R. Carey Davis, center, and Supervisor James Ramos outside Air Force One at the San Bernardino airport on Friday night.
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President Obama and First Lady Michelle Obama leave in a motorcade, after arriving at San Bernardino International Airport, to meet privately with the families of the victims of the San Bernardino terrorist attack.
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President Obama and First Lady Michelle Obama depart Air Force One at San Bernardino International Airport.
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San Bernardino residents Ashrie Matthews, left, Leah Brown and James Matthews line the street to cheer the president’s motorcade.
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President Obama stopped in San Bernardino on Friday evening to privately visit with the families of some of the victims of the Dec. 2 terrorist attack. Ashrie Matthews, left, Leah Brown and James Matthews joined others to cheer as the president’s motorcade passed.
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Anti-Obama protester Deann D’Lean, right, holds some of the many signs she brought to a small protest. In the background, Paul Rodriguez, Jr., with America First Latinos holds a bullhorn. Protesters were out on some San Bernardino street corners voicing their opposition to the president and Islamic State.
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People continue to visit the memorial just down the street from where the terrorist attack occurred.
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Family members and friends pay their respects to Robert Adams, one of the 14 victims killed in the San Bernardino shooting, during his graveside funeral service at Montecito Memorial Park in Colton.
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Summer Adams, center, grieves at the graveside ceremony for her husband, Robert Adams, at Montecito Memorial Park in Colton.
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A mourner sits on the curb with her head in her hands during the graveside ceremony for San Bernardino shooting victim Robert Adams at Montecito Memorial Park in Colton.
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Mourners embrace at the funeral for Aurora Godoy at Calvary Chapel in Gardena on Wednesday. Godoy was one of 14 killed in the attack in San Bernardino on Dec. 2. (Michael Robinson Chavez / Los Angeles Times)
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Mourners embrace at the funeral for Aurora Godoy at Calvary Chapel in Gardena on Wednesday. Godoy was one of 14 killed in the attack in San Bernardino on Dec. 2.
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Mourners arrive for the funeral for San Bernardino shooting victim Aurora Godoy at Calvary Chapel in Gardena on Wednesday.
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Shemiran Betbadal, mother of Bennetta Betbadal, is hugged by family after funeral services at Sacred Heart Catholic Church in Rancho Cucamonga.
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Pallbearers carry the casket of Bennetta Bet-Badal during funeral services Monday at Sacred Heart Catholic Church in Rancho Cucamonga. Bet-Badal was one of the 14 people killed in the San Barnardino shooting rampage.
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The husband and children of Bennetta Bet-Badal hug Monday following her funeral services at Sacred Heart Catholic Church in Rancho Cucamonga.
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Funeral services were held for Bennetta Bet-Badal, one of the 14 people killed in the San Barnardino shooting rampage, at Sacred Heart Catholic Church in Rancho Cucamonga.
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Funeral services were held for Bennetta Bet-Badal at Sacred Heart Catholic Church in Rancho Cucamonga.
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Funeral services were held for Bennetta Bet-Badal at Sacred Heart Catholic Church in Rancho Cucamonga.
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Twelve days after the mass shooting attack at the Inland Regional Center in San Bernardino the flowers are beginning to wilt but hugs and paryers are still in abundance.
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Gwen Rodgers, assistant pastor at the Church of Living God, hugs Cindy Quinones, cousin of the slain Aurora Godoy, during a vigil at the makeshift memorial for the victims of the terrorist attacks in San Bernardino, Calif.
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Visitors arrive to pay their respects at the makeshift memorial outside the fenced off Inland Regional Center, in the background, the site of the deadly terrorist attacks, in San Bernardino, Calif.
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San Trinh, the longtime boyfriend of Tin Nguyen, 31, one of the victims of the San Bernardino terrorist attack, is consoled by family members as Nguyen’s casket is loaded into a hearse at St. Barbara’s Catholic Church in Santa Ana.
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Cousins of Tin Nguyen -- Trang Le, left, Tram Le and Krystal Le -- hold onto some of her personal items and cry as they watch her casket being lowered into the ground at her funeral at the Good Shepherd Cemetery in Huntington Beach.
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Pallbearers stand guard over the casket of the Tin Nguyen, a Cal State Fullerton graduate, at the start of her memorial service at St. Barbara’s Catholic Church in Santa Ana.
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Van Thanh Nguyen shouts her daughter’s name during her funeral at the Good Shepherd Cemetary in Huntington Beach. Tin Nguyen was 31.
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Family members and friends write messages on the side of the Tin Nguyen’s burial vault.
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Van Thanh Nguyen places her hand on her daughter’s casket while surrounded by friends and family.
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The casket of San Bernardino shooting victim Isaac Amanios leaves the St. Minas Orthodox Church during his funeral service in Colton.
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Two women cry during Isaac Amanios’ funeral service at the St. Minas Orthodox Church in Colton. Amanios, 60, is survived by his wife and three children.
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Funeral goers cry during Isaac Amanios’ service. Amanios had shared a cubicle with the male shooter at the San Bernardino County Public Health Department.
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Frineds and family stand during the funeral service for Isaac Amanios.
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Trenna Meins, center with daughters after the funeral for her husband Damian Meins at St. Catherine Of Alexandria in Riverside.
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Pallbearers escort the casket of Damian Meins at St. Catherine of Alexandria church in Riverside.
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Mourners gather at St. Catherine Of Alexandria in Riverside on Friday morning for the funeral of Damian Meins, one of 14 people killed in the San Bernardino shooting.
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Trenna Meins places a cross on her husband’s coffin. Damien Meins was killed in a terrorist attack at the Inland Regional Center in San Bernardino.
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Mourners gather for the funeral of Damian Meins.
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Community members sing Amazing Grace during a candlelight vigil for Nicholas Thalasinos and the 13 other San Bernardino shooting victims at Fleming Park in Colton, Calif.
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COLTON, CA - DECEMBER 10, 2015: Jennifer Thalasinos,middle, fights back tears during a candlelight vigil for her slain husband Nicholas Thalasinos and the 13 other San Bernardino shooting victims at Fleming Park on December 10, 2015 in Colton, California.(Gina Ferazzi / Los Angeles Times) (Gina Ferazzi / Los Angeles Times)
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A portrait of Yvette Velasco, one of the victims of the deadly San Bernardino terrorist attacks, is placed at her funeral service at Forest Lawn Memorial Park, in Covina, Calif.
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Robert Velasco, father of Yvette Velasco, consoles a family member during Yvette’s funeral service at Forest Lawn Memorial Park, in Covina, Calif.
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COVINA, CALIF.--December 10, 2015 - The coffin of San Bernardino shooting victim, Yvette Velasco, is carried to the hearse following a private viewing for family at Forest Lawn Mortuary in Covina, Calif.
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An FBI dive team searches a lake located about two miles north of the Inland Regional Center in connection with last week’s terrorist attack and shootout that left the two attackers and 14 victims dead.
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An FBI dive team searches a lake near the Inland Regional Center in connection with last week’s terrorist attack.
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A memorial to victims of the terrorist attack in San Bernardino continues to grow near the Inland Regional Center, where the attack took place during a holiday party.
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One week after the mass shooting at the Inland Regional Center in San Bernardino, the public is posting signs of gratitude and thanks like this one found at the San Bernardino Police Department.
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Family members and survivors paid their respects with a moment of silence at 11 a.m., exactly one week after the shooting occured at the Inland Regional Center.
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Customers wait for the doors to open at Turner’s Outdoorsman in San Bernardino Wednesday morning.
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Speaking during a Dec. 8 news conference, dispatcher Michelle Rodriguez of the San Bernardino County Sheriff’s Department becomes emotional as she recounts the events of the deadly San Bernardino attack.
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Trenna Meins, right, of Riverside, hugs friends and family during a vigil t the Riverside County Health Complex for her husband, Damian Meins, and 13 others killed in the San Bernardino shooting rampage.
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On Dec. 8, people bring flowers, candles and remembrances to a memorial to the San Bernardino shooting victims near the Inland Regional Center, the scene of the attack.
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Frank Cobet of the Get Loaded gun store in Grand Terrace shows a customer an AR-15 rifle on Dec. 8.
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Monica Gonzales relights candles Tuesday morning at a memorial for victims of the shooting rampage in San Bernardino.
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Community members and students gather for a Dec. 7 vigil on the Cal State San Bernardino campus to remember the victims of the deadly attack in the city.
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Patricia Corona of Colton, Calif., holds her children, Dejah Salvato, 7, and Brandon Salvato, 9, as they attend a Dec. 7 vigil at the San Bernardino County Board of Supervisors headquarters to pay tribute to the victims of the city’s recent mass shootings.
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A prayer is said at the San Bernardino County Board of Supervisors headquarters to honor the victms of the city’s recent mass shootings.
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FBI agents put up a screen to block the view of onlookers as they investigate the building at the Inland Regional Center in San Bernardino.
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Syed Farook, father of the suspect in the San Bernardino mass shooting, Syed Rizwan Farook, arrives at his home to a swarm of reporters in Corona, Calif.
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Roses are laid at the entrance to San Bernardino County headquarters as thousands of employees returned to work Monday, five days after Syed Rizwan Farook and Tashfeen Malik opened fire on a gathering of his co-workers, killing 14 people and wounding 21.
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Trudy Raymundo, director the the San Bernardino County Department of Public Health, is surrounded by San Bernardino County supervisors as she addresses the media during a press conference Monday.
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John Ramos of Riverside pays his respects Monday at a makeshift memorial site honoring Wednesday’s shooting victims in San Bernardino.
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Claudia Zaragoza writes a message on a banner at the ever-growing memorial site to the victims of the recent mass shootings near the Inland Regional Center.
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Caroline Campbell, from left, Jessie Campbell and Rylee Ponce embrace as they pay their respects at the ever-growing memorial site for the victims of the recent mass shootings.
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Caroline Campbell embraces her son, David Malijan, 6, as they pay their respects at the ever-growing memorial site to the victims of the recent mass shootings near the Inland Regional Center.
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The Zafarullah family of Chino, originally of Pakistan, watches Obama’s address. Arshia, at left, is holding her 18-month-old nephew, Sohail Ahmed.
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One of several signs supporting the city of San Bernardino hang above the 215 Freeway on Sunday evening.
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Members of the Muslim community, such as Khadija Zadeh, lit candles and wrote messages to the families of victims of the San Bernardino shooting rampage during a memorial service at the Islamic Community Center of Redlands in Loma Linda.
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Ajarat Bada prays during a memorial service at the Islamic Community Center of Redlands in Loma Linda to remember the victims of the San Bernardino shooting rampage.
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Alaa Alsafadi, center, holds her son, Yousef, 4, during a memorial service at the Islamic Community Center of Redlands in Loma Linda.
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Riders from the Christian Motorcycle Association in San Bernardino pray at a growing makeshift memorial for San Bernardino shooting victims near the Inland Regional Center.
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A candlelight vigil dubbed “United We Stand,” took place at Granada Hills Charter High School on Saturday evening. The event was organized by Muslim Youth Los Angeles and Devonshire Area in Partnership.
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Ryan Reyes, boyfriend of San Bernardino shooting victim Larry Daniel Kaufman, hugs members of Dar Al Uloom Al Islamiyah of America mosque who brought roses to a memorial at the Sante Fe Dam on Saturday.
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A bullet hole in the window of a pick up truck where the shootout took place on San Bernardino Avenue.
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A composite photo of the 14 victims of the San Bernardino shooting rampage. (Courtesy of family / Los Angeles Times)
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People kneel in prayer for victims of the recent mass shootings at the Inland Regional Center, in San Bernardino.
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After sunset, people continue to arrive at the memorial site for the victims of the recent mass shootings at the Inland Regional Center in San Bernardino.
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The scene after landlord Doyle Miller opened the doors and allowed the news media inside the Redlands town home where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly the recent mass shootings in San Bernardino, lived.
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Josie Ramirez-Herndon, center, and her daughter, Chelsie Ramirez, bottom left, join other community members as they pray during a candlelight vigil.
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Fabio Ahumada, a San Bernardino EMT, attends a vigil at San Manuel Stadium
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A couple embrace at the candlelight vigil to honor the victims of the mass shootings at the Inland Regional Center.
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Angel Meler-Baumgartner 11, who was a member of the Inland Regional Center, where the shooting occurred, attends a vigil at San Manuel Stadium for the victims.
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The Ahmadiyya Muslim Community USA held a press conference and prayer vigil at Baitul Hameed Mosque in Chino. The group denounced the massacre.
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Amy Mahmood, right, holds hands with a woman named Shenaz during the vigil at San Manuel Stadium.
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Ryan Reyes, center, breaks down after finding out his boyfriend of three years, Daniel Kaufman, 42, was one of those killed during Wednesday’s mass shooting at the Inland Regional Center in San Bernardino.
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Ryan Reyes holds an image of his boyfriend Daniel Kaufman who was confirmed as one of the 14 victims of Wednesday’s mass shooting at the Inland Regional Center in San Bernardino.
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Larry Jones, left, pastor of Crossover Outreach Church; Dr. Jeannetta Million, pastor of Victoria’s Believers Church; and Arnold Morales, pastor of King of Glory Church, pray for the victims and those involved in the mass shooting in San Bernardino.
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A coalition of church leaders comes together to pray for the victims and those involved in the San Bernardino shootings.
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FBI investigators inside the suspects’ Redlands home on Thursday morning.
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The investigation continues Thursday morning on San Bernardino Avenue, where two suspects in the mass shooting at the Inland Regional Center died in a shootout with police.
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Law enforcement stands guard at a police line as investigators work at a Redlands home after the San Bernardino attack.
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A SWAT team stands guard with a rifle pointed at a home that is being investigated by police after today’s San Bernardino’s mass shootings.
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Farhan Khan, second from right, who was identified as the brother-in-law of San Bernardino shooting suspect Syed Rizwan Farook, joins religious leaders during a news conference at the Council of American Islamic Relations in Anaheim.
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San Bernardino County sheriff’s deputies draw guns behind a minivan on Richardson St. during a search for suspects involved in the mass shooting of 14 people at the Inland Regional Center in San Bernardino.
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Marie Cabrera, Sonya Gonzalez and Christine Duran, all of San Bernardino, pray after the mass shooting in San Bernardino.
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A woman and a man enter the Rudy C Hernandez Community Center after they and other people, who were at the scene of a mass shooting, arrived by bus to be reunited with their familys.
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Emergency personnel bring in a wounded person into Loma University Medical Center after the shooting in San Bernardino on Wednesday.
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A SWAT unit is on the move in San Bernardino.
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A member of the San Manual Fire Department takes the names of people evacuated from the scene of a mass shooting in San Bernardino before they are loaded onto buses and taken away from the area.
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Sheriff’s department SWAT members deploy on Richardson Street in San Bernardino on Wednesday.
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Sheriff’s department SWAT members deploy near San Bernardino Avenue and Richardson Street in San Bernardino on Wednesday.
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Evacuated workers join in a circle to pray on the San Bernardino Golf Course across the street from where a shooting occurred at the Inland Regional Center.
(Gina Ferazzi / Los Angeles Times) Farook was self-radicalizing around that time, FBI Director James Comey said, and met Malik soon after, eventually marrying her and bringing her to the United States. Farook was a practicing Muslim. Marquez converted to Islam around the time he purchased the weapons, sources have told The Times.
FBI agents believe Farook abandoned his plans to launch the earlier attack after a law enforcement task force arrested three men in Chino in November 2012. The men were later convicted of charges related to providing material support to terrorists and plotting to kill Americans in Afghanistan. A fourth man arrested in Afghanistan also was convicted in the scheme.
Bowdich said federal agents are investigating whether the men had ties to Farook.
Marquez has emerged as a central figure in the investigation. The FBI had been conducting interviews with the 24-year-old, who checked himself in to a mental health facility after the attacks.
The former Wal-Mart security guard has waived his Miranda rights and cooperated with the inquiry, and it was Marquez who told FBI agents about Farook’s earlier plans, according to one of the government sources, who also requested anonymity.
“They were talking generally about something, but I don’t think it made it to anything specific,” one of the sources said of the earlier plot. “I don’t think it got to a time or a place.”
The source said it remains unclear whether Marquez had any involvement in the planning of the shooting or had any prior knowledge that an attack was pending.
Marquez, a cycling enthusiast who wanted to join the U.S. Navy, was a longtime friend and neighbor of Farook. He also married the sister of Farook’s sister-in-law last year, although the circumstances of the union are now under investigation, a government official previously told The Times.
There was no paperwork transferring ownership of the assault rifles from Marquez to Farook, as required by California law, government officials told The Times.
Hours after the shooting, Marquez posted a cryptic message on his Facebook page.
“I’m. Very sorry sguys,” the message read. “It was a pleasure.”
Bowdich on Thursday declined to answer questions about Marquez, who has not been charged with a crime.
Marquez told FBI agents that the Facebook post has been “misunderstood,” according to one of the government sources. Agents are concerned that Marquez’s mental and emotional state may affect what he has been telling interrogators, the source said.
While Marquez has spoken to agents about his ties to Farook, federal officials are still working to verify the information he has provided, the source said.
Marquez’s mother, Armida Chacon, addressed reporters on Thursday from her Tomlinson Avenue home in Riverside, sobbing as she said she hadn’t been in contact with her son since the day of the massacre.
“I don’t know how this happened.... My world is upside-down,” she said. “My life changed Wednesday.”
Chacon was outside with one of her sons, cleaning up the broken glass and twisted panels of their garage door. The damage occurred when federal agents raided the stucco home over the weekend.
As she combed through the wreckage of the garage door, Chacon eventually turned to the reporters camped out on the street and agreed to an off-camera interview.
Marquez was his mother’s “right hand at home,” helping take care of his brothers, she said.
She said her son loved to hang out with friends and go to parties.
“My son is a good person,” she said.
When asked about Farook, Chacon said her son was friends with him and “nothing more.”
Chacon said she was overwhelmed by news of the shooting and had spent the last several days crying inside her home.
“I want this to stop,” she said.
After speaking to reporters for about 10 minutes, Chacon turned and walked back inside the house.
She was still crying.
richard.serrano@latimes.com; richard.winton@latimes.com; sarah.parvini@latimes.com; james.queally@latimes.com
Twitter: @RichardSerranoLAT; @lacrimes; @sarahparvini; @JamesQueallyLAT
Times staff writer Kate Mather contributed to this report.
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