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 who are demonstrating discontent in the streets.

The detained man, Marcos Leao, 27, an immigrant and a U.S. Army veteran, said after he was released that he was told to get on the ground upon venturing into a restricted area, as he crossed a line of yellow tape to avoid walking around the building.