Pop star Rihanna on Sunday night responded to reports that the U.S. Border Patrol fired tear gas at migrants, calling it an act of "terrorism."

She posted an Instagram drawing attention to a report that that U.S. Border Patrol had "just launched tear gas into Mexico."

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"Breeze carrying it hundreds of yards," read the tweet from an Associated Press reporter that Rihanna screenshotted. "Parents running away with choking toddlers."

"Terrorism," Rihanna captioned the Instagram.

U.S. agents fired tear gas on Sunday afternoon as dozens of migrants sought to breach the border between Tijuana and California. Multiple outlets reported that children were caught in the crosshairs.

Immigration activists and Democrats have been criticizing Customs and Border Protection (CBP) over its use of force, posting photos and videos of adults clutching children tightly as they ran from the spreading tear gas.

U.S.-Mexico border near Tijuana closed as migrants attempt to breach fence:



“Some of these migrants attempted to breach legacy fence infrastructure…and sought to harm CBP personnel by throwing projectiles at them,” DHS Sec. Nielsen said in a statement. https://t.co/YP5cIFX5KZ pic.twitter.com/U0voEg1yAs — ABC News (@ABC) November 25, 2018

Trump officials said the force was necessary, as the migrants were seeking to cross the border illegally. Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE accused some of the migrants of throwing “projectiles” at CBP agents.

“These children are barefoot. In diapers. Choking on tear gas," California Gov.-elect Gavin Newsome tweeted. “Women and children who left their lives behind — seeking peace and asylum — were met with violence and fear. That’s not my America. We’re a land of refuge. Of hope. Of freedom. And we will not stand for this.” These children are barefoot. In diapers. Choking on tear gas.



Women and children who left their lives behind -- seeking peace and asylum -- were met with violence and fear.



That’s not my America. We’re a land of refuge. Of hope. Of freedom.



And we will not stand for this. https://t.co/1APpeHIq6v — Gavin Newsom (@GavinNewsom) November 26, 2018

Cindy Milla, a 23-year-old Honduran migrant who is in Tijuana with her two young children, told The Wall Street Journal that she "ran for her life" when the tear gas began.

"I felt that my face was burning, and my baby fainted," Milla said. "I ran for my life and that of my children."

Seeking asylum at the border is legal. This administration’s violence against families is unconscionable and inhumane. https://t.co/ySfRmrqIOH — NWLC (@nwlc) November 26, 2018

Forty-two people were arrested by U.S. authorities after they crossed the border near Tijuana, according to San Diego immigration authorities.

Thousands of migrants have been camped out in squalid conditions in a Tijuana sports stadium for more than a week, according to The New York Times. They are waiting to make asylum claims in the U.S. as they seek to escape rampant poverty and violence in their home countries.