Dozens of U.S. Border Patrol agents showed up Thursday morning in downtown Los Angeles, where Gov. Gavin Newsom and other California political leaders were speaking at an event, and detained at least one person in the latest high-profile immigration enforcement operation in the city.

A group of masked U.S. Border Patrol agents showed up in trucks outside of the press conference at the Japanese American National Museum.

U.S. Customs and Border Protection agents showed up outside of a Los Angeles press conference held by Gov. Gavin Newsom on Thursday morning, amid escalating tensions between Newsom and President Donald Trump.