Police arrest a person during the dispersal of an unlawful assembly at the Immigration and Customs Enforcement detention center in Portland, Ore., Sept. 18, 2020. Nathan Howard/Getty Images
Rioters in Portland on Monday assaulted police officers using rocks and other hard objects.
Portland Police Bureau officers observed around 8:45 p.m. people gathering with shields, body armor, and helmets at Kenton Park, near the building of the Portland Police Association, a police union.
