The new year brought continued tensions along the U.S. -Mexico border as U.S. authorities fired tear gas at migrants from the Central American caravan that has gathered there.
Shortly after the New Year began, dozens of migrants stood on a hill from which they could see United States border agents, who watched them closely. Agency spokesman Andrew Meehan says that after rocks were involved, it became "an issue of safety for the officers and frankly safety of the migrants".
Migrants at the scene said they arrived last month with the caravan from Honduras.
It said its agents could not assist the children because of the rocks being thrown.
Tear gas was sacked as migrants tried to cross the border into the US.
A previous incident in November when US agents fired gas into Mexico to disperse migrants triggered a call from Mexico's government for an investigation, as well as worldwide condemnation.
U.S. Customs and Border Protection said the group was attempting to climb over and under the San Diego border fence.
Migrants run as tear gas is thrown by U.S. Border Protection officers to the Mexican side of the border fence after they climbed the fence to get to San Diego, Calif., from Tijuana, Mexico, Tuesday, Jan. 1, 2019.
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About 150 migrants approached the fence, but about one-third of the group members turned back into Mexico when they saw Border Patrol agents, CBP estimated. "We don't like that type of violence of throwing rocks".
At least three volleys of gas were launched onto the Mexican side of the border near Tijuana's beach early Tuesday.
A Reuters witness documented in one photo where a migrant had been hit by what appeared to be a gas canister.
Twenty-five people were apprehended, CBP said, without elaborating about where the detainees were sent.
A Homeland Security spokesperson described the group as "a violent mob".
The migrants in both cases were part of a caravan that left Central America in October and traveled 4,300 kilometers (2,600 miles) to Tijuana in the hope of reaching the United States and requesting asylum. Others have found jobs in Mexico and tried to settle there.
Mr. Trump is now locked in a fight with congressional Democrats over funding for the border wall that he wants to build.
The United States has also pushed Mexico to house Central American migrants while they seek US asylum. The stalemate has led to a partial government shutdown.