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.

U.S. President Donald Trump can keep his deployment of National Guard troops in Los Angeles, according to a court ruling, as protests against immigration raids look set to enter their second week in the strongest backlash since his return to power in January.

President Donald Trump's deployment of L.A. will be “the first, perhaps, of many,” he told reporters this week.

The National Guard has at times detained protesters in its deployment to Los Angeles, an official said Wednesday, as demonstrations against Immigration and Customs enforcement raids spread to other major cities.