By TERRY CHEA and CHRISTOPHER WEBER,  ALAMEDA, Calif. (AP):- Protesters gathered Thursday outside a U.S. Coast Guard base in the San Francisco Bay Area, where U.S. Customs and Border Protection agents began arriving to support federal efforts to track down immigrants in the country illegally.

A few hundred people, many singing hymns and carrying signs saying “No ICE or troops in the Bay,” referring to U.S. Immigration and Customs Enforcement, gathered shortly after dawn outside Coast Guard Island in Alameda. Police used at least one flash-bang grenade to clear a handful of demonstrators from the entrance as CBP vehicles drove through.

Organizers urged protesters to remain peaceful, as a line of Coast Guard officers in helmets watched from just outside the entrance.

The San Francisco Chronicle, citing an anonymous source with knowledge of the operation, reported Wednesday that more than 100 CBP and other federal agents would arrive this week. San Francisco Mayor Daniel Lurie and California Gov. Gavin Newsom, both Democrats, condemned the move, saying it is meant to provoke violent protests.

CBP did not respond to a request for comment Wednesday from The Associated Press. A statement provided to media by the Coast Guard said that “through a whole of government approach, we are leveraging our unique authorities and capabilities to detect, deter, and interdict illegal aliens, narco-terrorists, and individuals intent on terrorism or other hostile activity before they reach our border.”

Newsom’s office said Thursday people should memorize contact information in case they’re detained. “Act intelligently, take care of yourself, and don’t give them the pretext they’re looking for to intensify their repression,” Newsom’s office said in a post on the social platform X.

Soon after the deployment was first reported Wednesday, Lurie livestreamed a nine-minute statement from City Hall, flanked by other elected officials, and cautioned against giving federal officials working from “a playbook” any excuse to crack down. President Donald Trump has repeatedly said he plans to deploy National Guard troops to the city to quell crime, but his administration hasn’t offered a timeline for doing so.

“In cities across the country, masked immigration officials are deployed to use aggressive enforcement tactics that instill fear so people don’t feel safe going about their daily lives,” Lurie said. “These tactics are designed to incite backlash, chaos and violence, which are then used as an excuse to deploy military personnel.”

Trump has deployed the Guard to Washington, D.C., and Memphis, Tennessee, to help fight what he says is rampant crime. Los Angeles was the first city where Trump deployed the Guard, arguing it was necessary to protect federal buildings and agents as protesters fought back against mass immigration arrests.

He has also said they are needed in Chicago and Portland, Oregon. Lawsuits from Democratic officials in both cities have so far blocked troops from going out on city streets.

Trump recently renewed his musings about sending the Guard to San Francisco, telling Fox News on Sunday the city “was truly one of the great cities of the world” before it went “wrong” and “woke.”

His assertions of out-of-control crime in the city of roughly 830,000 have baffled local and state leaders, who point to statistics showing that many crimes are at record lows.

Newsom’s administration said it would push back on any deployment, as it did when Trump ordered the Guard into Los Angeles against the governor’s wishes. California Attorney General Rob Bonta vowed to “be in court within hours, if not minutes,” if there is a federal deployment. San Francisco City Attorney David Chiu promised the same.

Coast Guard Island is an artificial island formed in 1913, and the Coast Guard first established a base there in 1926. The island is owned by the federal government and is not open to the general public, so escorts or specific government ID cards are required for visitors. The Coast Guard is part of the Department of Homeland Security, which also houses ICE and CBP.

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Weber reported from Los Angeles. Associated Press journalists Jonathan Matisse in Nashville, Tennessee, and Janie Har in San Francisco contributed.