Photos: Massacre at another Mexico rehab clinic

A soldier guards the perimeter of the drug rehab center. where, according to local media, at least ten interns were killed after unidentified gunmen stormed the place early Wednesday, Sept. 16, 2009. It’s the sixth drug treatment center attacked in Ciudad Juarez in the last 13 months. Eighteen people were slain in similar fashion on Sept. 2.  (Guillermo Arias / Associated Press)

A forensic van leaves the drug rehab center. A survivor, who watched the massacre from a hiding place inside the clinic, told reporters that as many as eight gunmen opened fire helter-skelter, shooting patients and anyone else in the building.  (Guillermo Arias / Associated Press)

Relatives wait for news outside the Life Annex drug rehab center. The shooting started around 10:15 p.m. Some neighbors said they at first confused the gunfire with fireworks exploding in the city’s main square as part of Independence Day festivities that started late Tuesday and continued through today.  (Guillermo Arias / Associated Press)

Soldiers stand outside the drug rehabilitation center where, according to local media, at least 10 people were killed after unidentified gunmen stormed it. Five other people were killed early today in Ciudad Juarez when gunmen attacked the Coco Bongo nightclub as customers were deep in celebration of Mexican Independence Day.  (Raymundo Ruiz / Associated Press)

Soldiers and investigators walk near the drug rehab center. The shooting started around 10:15 p.m.  (Guillermo Arias / Associated Press)