An immigration enforcement operation at Ontario Advanced Surgical Center in Ontario is drawing criticism from immigrant rights advocates after a landscaper was taken into custody.

LA Mayor Karen Bass told reporters there were children in a park attending a day camp when masked federal agents arrived.

U.S. authorities are vowing to continue their month-long crackdown on illegal immigration in Los Angeles, after roughly 100 federal agents amassed near MacArthur Park in the Westlake area, but left without appearing to make any arrests.

Democratic Los Angeles Mayor Karen Bass on Monday demanded federal agents leave the scene at a MacArthur Park immigration raid.

California Attorney General Rob Bonta and a coalition of 18 states have filed an amicus brief to halt aggressive ICE and CBP immigration raids in Los Angeles, citing constitutional violations and harm to public safety and the economy.

Heavily armed federal agents conducted an immigration enforcement operation in Los Angeles's MacArthur Park on Monday morning, provoking immediate outrage. Los Angeles Mayor Karen Bass arrived at the scene, describing the presence of agents in military-style gear as "absolutely outrageous" and demanding the operation cease.

ICE responded to Los Angeles Mayor Karen Bass's call for federal immigration authorities to "go home," stating they will continue operations despite the mayor's opposition to raids

Federal agents conducted a federal immigration sweep at MacArthur Park in LA's Westlake District late Monday morning.