Migrants stand by tear gas canisters they collected that were shot towards the Mexican side by U.S. Border Patrol officers after they attempted to get into the U.S. side to San Diego, Calif., from Tijuana, Mexico, Tuesday, Jan. 1, 2019. Discouraged by the long wait to apply for asylum through official ports of entry, many migrants from recent caravans are choosing to cross the U.S. border wall and hand themselves in to border patrol agents. (AP Photo/Daniel Ochoa de Olza)
A migrant jumps the border fence to get into the U.S. side to San Diego, Calif., from Tijuana, Mexico, Tuesday, Jan. 1, 2019. Discouraged by the long wait to apply for asylum through official ports of entry, many migrants from recent caravans are choosing to cross the U.S. border wall and hand themselves in to border patrol agents. (AP Photo/Daniel Ochoa de Olza)
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United States Border Protection officers point their weapons at migrants as they prepared to cross the border fence to get into the U.S. side to San Diego, Calif., from Tijuana, Mexico, Tuesday, Jan. 1, 2019. Discouraged by the long wait to apply for asylum through official ports of entry, many migrants from recent caravans are choosing to cross the U.S. border wall and hand themselves in to border patrol agents. (AP Photo/Daniel Ochoa de Olza)
Migrants stand by the border fence as they attempt to get into the U.S. side to San Diego, Calif., from Tijuana, Mexico, Tuesday, Jan. 1, 2019. Discouraged by the long wait to apply for asylum through official ports of entry, many migrants from recent caravans are choosing to cross the U.S. border wall and hand themselves in to border patrol agents. (AP Photo/Daniel Ochoa de Olza)
A migrant looks trough a hole at the border fence as he attempts to get into the U.S. side to San Diego, Calif., from Tijuana, Mexico, Tuesday, Jan. 1, 2019. Discouraged by the long wait to apply for asylum through official ports of entry, many migrants from recent caravans are choosing to cross the U.S. border wall and hand themselves in to border patrol agents. (AP Photo/Daniel Ochoa de Olza)
A U.S. Border Protection officer stands under the rain as he watches the border fence between the U.S. side and San Diego, Calif., from Tijuana, Mexico, Tuesday, Jan. 1, 2019. Discouraged by the long wait to apply for asylum through official ports of entry, many migrants from recent caravans are choosing to cross the U.S. border wall and hand themselves in to border patrol agents. (AP Photo/Daniel Ochoa de Olza)
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U.S. authorities fired tear gas into Mexico during the first hours of the new year to repel about 150 migrants who tried to breach the border fence in Tijuana.
U.S. Customs and Border Protection said in a statement later Tuesday the gas was used to target rock throwers apart from the migrants who were trying to cross.
“No agents witnessed any of the migrants at the fence line, including children, experiencing effects of the chemical agents, which were targeted at the rock throwers further away,” the statement said.
An Associated Press photographer saw at least three volleys of gas launched onto the Mexican side of the border near Tijuanas beach that affected the migrants, including women and children, as well as journalists. The AP saw rocks thrown only after U.S. agents fired the tear gas.
The agency said agents saw “toddler sized children” being passed over concertina wire with difficulty. It said its agents could not assist the children because of the rocks being thrown. Agents responded with smoke, pepper spray and tear gas, it said. The AP journalist also saw plastic pellets fired by U.S. agents.
The agency said 25 migrants were detained while others crawled back into Mexico through a hole under the fence.
Customs and Border Protection said that under its use of force policy the incident would be reviewed by its Office of Professional Responsibility.
Migrants who spoke with AP said they arrived in Tijuana last month with the caravan from Honduras.
The caravan, which left Honduras in mid-October, grew to more than 6,000 members during its month-and-a-half trek north. It has been a constant target of President Donald Trump, who referred to it frequently in the run-up to U.S. mid-term elections in November.
Many of the migrants are waiting in Tijuana for a chance to apply for asylum in the U.S., but there was a backlog before the caravans arrival and the wait is expected to be many months. Others have found jobs in Mexico and tried to settle there.
In a previous incident, U.S. agents launched tear gas across the border after some migrants tried to breach the border following a peaceful march in Tijuana on Nov. 26. Hundreds of migrants who were downwind of the gas were affected.
Trump is currently locked in a fight with congressional Democrats over funding for the border wall that he wants to build. The stalemate has led to a partial government shutdown.
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