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.

After an initial turnout early Thursday morning with protesters attempting to block vehicles going through the base gates, the gathering turned into a day-long standoff between California Highway Patrol officers in riot gear and protesters. Thursday afternoon, another large group of protesters marched from a rally in Oakland's Fruitvale District to the 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 immigra

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