Members of the L.A.P.D. in downtown Los Angeles. National Guard troops in riot gear surrounded a federal building. Protests started near a complex of federal buildings but spread to other areas downtown in the evening. Law enforcement officers were stationed around the federal complex all day.

The request from Homeland Security, confirmed by a Defense official, also seeks “drone surveillance support,” direction to troops on detaining or arresting “lawbreakers,” and graduates from an organization like the Marines’ School of Advanced Warfighting School for setting up a joint operation center.

Police made a handful of arrests on the second night of the curfew in downtown Los Angeles as mayors urged the Trump administration to withdraw the military and stop the immigration raids.