Obvious this is Trump's response using Trump-supporting personnel. They are trying to inflame the situation for electoral purposes.
"US attorney requests DHS investigation after video shows masked, camouflaged federal authorities arresting protesters in Portland
The US Attorney for the Oregon District on Friday requested an investigation into the masked, camouflaged federal authorities without identification badges who are arresting protesters in Portland.
The request is aimed specifically at the Department of Homeland Security (DHS) personnel who have been captured on various videos arresting protesters and putting them in unmarked SUVs.
Demonstrators in Portland have been protesting racial inequality and police brutality for the last 50 nights, US Attorney Billy J. Williams said in a statement. Federal authorities have protected the Mark O. Hatfield US Courthouse and, at times, interaction between protesters and law enforcement has gotten violent. Last weekend, one protester was seriously injured after the man was shot in the head with impact munition."
http://edition.cnn.com/2020/07/18/us/portland-arrests-federal-authorities/index.html?utm_term=link&utm_source=twCNN&utm_content=2020-07-18T22%3A00%3A12&utm_medium=social