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 were trying to breach the border fence in Tijuana.
An Associated Press photographer witnessed at least three volleys of gas launched onto the Mexican side of the border near Tijuanas beach early Tuesday. It affected the migrants, including women and children, as well as members of the press.
Migrants who spoke with AP said they arrived last month with the caravan from Honduras.
U.S. Customs and Border Protection says in a statement that the gas was aimed at rock throwers on the Mexican side who prevented agents from helping children who were being passed over the concertina wire. The agency says 25 migrants were detained.
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