Federal officers using unmarked vehicles to detain protesters in Portland

Federal officers, clad in unmarked military fatigues and driving unmarked vans, have reportedly been abruptly grabbing and detaining protesters in Portland, Ore., as the tension between the forces sent to protect federal property and demonstrators continues.

Protests sparked by the police killing of George Floyd in Minneapolis at the end of May have been dominating Portland's downtown area for well over a month. The demonstrations have, at times, led to damage of federal buildings, which is what prompted Chad Wolf — acting secretary of the Department of Homeland Security — to send federal officers to the Rose City in recent weeks.

President Trump has repeatedly threatened to send federal forces into the cities that have been gripped by demonstrations in the months since Floyd's killing, condemning the protesters as anarchists and looters.