Riot declared during US May Day protests in Portland

Police declared a riot in the northwest US city of Portland after "anarchists" threw rocks, smoke bombs and soda cans at officers during a May Day rally, while thousands more marched in other major cities.Several businesses in Portland's downtown area were also vandalized by groups of people wearing black masks who were seen breaking storefront windows, throwing incendiary devices and attacking a police vehicle."Due to actions of anarchists in #MayDayPDX march, permit was cancelled.