U.S. fires tear gas into Mexico to repel migrants

A migrant family, part of a caravan of thousands traveling from Central America en route to the United States, runs away from tear gas in front of the border wall between the U.S and Mexico in Tijuana, Mexico November 25, 2018.

Migrants run from tear gas, thrown by the U.S. border patrol, near the border fence between Mexico and the United States in Tijuana, Mexico, November 25, 2018.

A migrant girl from Honduras cries after running away from tear gas thrown by the U.S. border control near the border wall between the U.S. and Mexico in Tijuana, Mexico November 25, 2018.

Migrants from Central America and journalists are hit by tear gas after hundreds tried to illegally cross the Mexico border into the United States in Tijuana, Mexico November 25, 2018.

U.S. soldiers and U.S. border patrol fire tear gas towards migrants, part of a caravan of thousands traveling from Central America en route to the United States, from the U.S. side of the border fence between Mexico and the United States in Tijuana, Mexi

Migrants return to Mexico after being hit by tear gas by U.S. Customs and Border Protection (CBP) after attempting to illegally cross the border wall into the United States in Tijuana, Mexico November 25, 2018.

A U.S. Army helicopter patrols from the sky as migrants climb the border fence between Mexico and the United States in an attempt to cross into the U.S. side of the border in Tijuana, Mexico, November 25, 2018.

Migrants run from tear gas released by U.S. border patrol, near the border fence between Mexico and the United States in Tijuana, Mexico, November 25, 2018.

Migrants stand near the border fence between Mexico and the United States as U.S. border patrol officers look on, in Tijuana, Mexico, November 25, 2018.

U.S. border patrol officers look at the Mexican side as they stand next to the fence between the United States and Mexico in Tijuana, Mexico November 25, 2018.

Migrants make their way across Tijuana river near the border wall between the U.S. and Mexico in Tijuana, Mexico November 25, 2018.

A migrant girl stands in front of the border fence between Mexico and the United States in Tijuana, Mexico, November 25, 2018.

Migrants are stopped by riot police as they make their way near the border fence between Mexico and the United States in Tijuana, Mexico, November 25, 2018.

U.S. border patrol officers detain a group of migrants after they entered the United States illegally by jumping over the border fence between Mexico and the United States, from Tijuana, Mexico, November 25, 2018.

Migrants make their way to the border fence between Mexico and the United States in Tijuana, Mexico, November 25, 2018.

Migrants stand near the border fence between Mexico and the United States in Tijuana, Mexico, November 25, 2018.

Migrants climb a wall to evade police and reach the border wall between the U.S. and Mexico in Tijuana, Mexico November 25, 2018.