By late morning it was clear, June 6 was no ordinary Friday in LA. Federal agents arrested people in and around downtown Los Angeles. Some day laborers near a Home Depot in Westlake, others working in the Fashion District at Ambience apparel.

As the military presence ramped up in Los Angeles, communities are preparing for the largest protests against Trump since he took office.

United States Army North confirmed to ABC News that Marines at the Wilshire Federal Building have made the first temporary detention among the troops sent to Los Angeles on Friday.

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