LOS ANGELES/WASHINGTON -Marines deployed to Los Angeles temporarily detained a civilian on Friday, the U.S. military confirmed after being presented with Reuters images, in the first known detention by active-duty troops deployed there by President Donald Trump.

The incident took place at the Wilshire Federal Building in Los Angeles where Marines took charge of the mission to protect the building earlier on Friday, in a rare domestic use of U.S. troops after days of protests over immigration raids.

Reuters images showed Marines apprehending a civilian, restraining his hands with zip ties and then handing him over to civilians from the Department of Homeland Security.

Asked about the incident, the U.S. military’s Northern Command spokesperson said active duty forces “may temporarily detain an individual in specific circumstances.”

“Any temporary detention ends immediately when the individual(s) can be safely transferred to the custody of appropriate civilian law enforcement personnel,” a spokesperson said.

The 200 Marines and more than 2,000 National Guard now deployed to Los Angeles are tasked with protecting federal property and federal personnel. They will be joined by an additional 500 Marines and 2,000 more National Guard soldiers.

This means that they will accompany ICE agents on raids, officials have said.

The troops are authorized to detain people who pose a threat to federal personnel or property, but only until police can arrest them. Military officials are not allowed to carry out arrests themselves.

The Posse Comitatus Act generally forbids the U.S. military, including the National Guard, from taking part in civilian law enforcement.

Trump could take a more far-reaching step by invoking the Insurrection Act, which would allow troops to directly participate in civilian law enforcement.

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(Reporting by Omar Younis, Phil Stewart, Idrees Ali; Editing by Leslie Adler and Sandra Maler)