(Portland, OR)  --  Police in Portland, Oregon arrested five people as a crowd staged what police declared a riot last night on the one-year anniversary of the killing of George Floyd.  The crowd that gathered downtown included people wearing helmets and carrying gas masks, backpacks and tote bags.  Some pushed a dumpster against the Multnomah County Justice Center and set it on fire.  Police say people chanted, "Burn it down."  George Floyd died in police custody in Minneapolis after an officer knelt on the unarmed Black man's neck for more than nine minutes the evening of May 25th, 2020.