By Omar Younis, Brad Brooks, Phil Stewart and Idrees Ali LOS ANGELES (Reuters) -U.S. Marines deployed to Los Angeles made their first detention of a civilian on Friday, the military said, part of a rare domestic use of its forces sent to the city after days of protests over immigration raids.

The troops are authorized to detain people who pose a threat to federal personnel or property, but only until police can arrest them.

Marines have moved into Los Angeles to guard a federal building after a week of protests against immigration raids, while communities across the country are preparing for demonstrations against President Donald Trump’s polices this weekend.

The Trump administration faces a legal challenge to its deployment of the military to protests. Tensions flared after President Trump sent troops, and protests spread to other U.S. cities.