Protesters gathered outside the entrance to Coast Guard Base Alameda Thursday ahead of an anticipated surge in President Trump's immigration enforcement crackdown in the San Francisco Bay Area.

The gathering turned into a day-long standoff between California Highway Patrol officers in riot gear and a group of protesters at the bridge to base, also known as Coast Guard Island, an artificial island in the Oakland Estuary between Oakland and Alameda.

U.S. officials told CBS News on Wednesday that the Trump administration planned to expand its nationwide crackdown on illegal immigration to the Bay Area, and that Border Patrol agents would stage at the base, located roughly 15 miles from San Francisco.

"DHS is targeting the worst of the worst criminal illegal aliens - including murderers,

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