U.S. Marines deployed to Los Angeles made their first detention of a civilian on Friday, part of a rare use of military force to support domestic police and coming ahead of national protests over President Donald Trump's military parade in Washington.

The detention of the man – a U.S. Army veteran and an immigrant who obtained U.S. citizenship – punctuated a series of highly unusual events that have appealed to Trump supporters but outraged other Americans demonstrating in the streets.

The detained man, Marcos Leao, 27, said after his release that he was told to get on the ground after venturing into a restricted area, having crossed a line of yellow tape to avoid walking around the building.

Trump ordered the Marines to Los Angeles in response to street protests over immigration raids, joining National Guard forces already deployed to the city over the objection of California's governor. Trump said troops were necessary to quell the protests – a contention that state and local officials dispute.

About 1,800 protests are scheduled across the U.S. on Saturday in opposition to the Washington military parade, which marks the 250th anniversary of the U.S. Army and coincides with Trump's 79th birthday.

Both the military parade and the domestic use of active-duty troops are uncommon for the United States, as is the military detention of a U.S. citizen on American soil.

Trump has thrived politically on unconventional tactics. But Democratic opponents are beginning to push back. Fifteen protests are expected in Los Angeles alone, Mayor Karen Bass said, urging people to remain peaceful.

"We are here today because the raids have caused fear and panic," Bass said, joined by two dozen elected officials to oppose the raids and military presence. "Can the federal government come in and seize power from a state and from a local jurisdiction? How much will the American people put up with?"

About 200 Marines were assigned to protect the Wilshire Federal Building in Los Angeles, part of a battalion of 700 Marines sent to support the National Guard, said Army Major General Scott Sherman, who is in command of both the National Guard and Marine forces.

The Marines and National Guard deployed in Los Angeles are assigned to protect federal property and personnel and may temporarily detain people, but they are required to turn them over to civilian law enforcement for any formal arrest.

(With input from Reuters)

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