Migrants try to cross border at Tijuana

A group of Central American migrants get over a fence as they try to reach the U.S.-Mexico border in Tijuana.

A Central American migrant is stopped by U.S. agents who order him back across the border after a group of migrants got past Mexican police.

Tear gas is used to prevent groups of people from crossing the border in Tijuana.

One man makes a stand as U.S. Border Patrol agents deploy tear gas on migrants refusing to step away from the concertina wire set up along the U.S.-Mexico border.

Migrants breach the police line set up by the Mexican federal police in San Ysidro.

A Honduran migrant speaks to U.S. Border Patrol agents on the other side of razor wire after they fired tear gas at migrants pressing to cross into the U.S. from Tijuana.

Mexican police run as they try to keep migrants from getting past a border crossing in Tijuana.

Migrants try to push past Mexican police on the U.S.-Mexico border in Tijuana.

Migrants walk up a river bank at the U.S.-Mexico border after pushing past a line of Mexican police in Tijuana.