Police declare riot after crowd smashes windows, sets fires in downtown Portland Portland Police Bureau Graffiti, damage to Oregon Historical Society in Portland PORTLAND, Ore. (KTVZ) — Portland police declared a riot in downtown Portland after a group of anti-police demonstrators started smashing windows and breaking into businesses Friday night. Multiple people have been arrested, KGW reported. The Portland Police Bureau said there were two separate marches downtown after 9 p.m., one of which became destructive while the other stayed peaceful. The one that was declared a riot started in Director Park on Southwest Ninth Avenue and Yamhill Street. At 9:45 p.m., police tweeted that participants had started to engage in criminal activity. A riot was declared minutes later.