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, 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.

"No one signs up to join the United States Marine Corps to attack protesters," U.S. Rep. Seth Moulton, D-6th District, a former Marine, told MSNBC on Sunday.

After a day of peaceful protests in Los Angeles, tensions mounted between protesters and Marines outside the federal building in downtown LA.

Business owners and residents in Los Angeles say that U.S. President Donald Trump sending in the National Guard and Marines is 'bad for business' in today's newsletter, as World Cup fans fret over his administration's aggressive immigration policies.

More than 700 Marines based out of the Marine Corps Air Ground Combat Center in California have been mobilized to respond to the protests in Los Angeles, and the troops will join the thousands of National Guard members who were activated by President Donald Trump over the weekend without the consent of California’s governor or LA’s mayor.

The Pentagon is scrambling to establish rules to guide U.S. Marines who could be faced with the rare and difficult prospect of using force against citizens on American soil, now that the Trump administration is deploying active duty troops to the immigration raid protests in Los Angeles.

President Donald Trump has sent the Marines to Los Angeles in an effort to quash anti-ICE protests that have ravaged parts of the city on Tuesday. Images from L.A. show masked protesters blocking roads,

U.S. Attorney Bill Essayli said at least nine people face federal charges related to the demonstrations. The protests have been prompted by Immigration and Customs Enforcement sweeps spurred by President Trump's directive to find immigrants living in the United States without legal status.