Protests erupted at a time when tensions were running high between Donald Trump and Joe Biden in the US presidential election.
Police have seized fireworks, hammers and rifles in Portland. At that time 11 people have been arrested from there.
The New York Police Department says 50 people have been arrested since protests broke out in the city late Wednesday. News Reuters.
The BBC says Oregon Governor Kate Brown activated the National Guard after anti-Trump protests turned violent, demanding every vote count in Portland, Oregon.
Witnesses say some people broke away from the protest and smashed the windows of some shops in the city center. Police called it a riot.
Two hundred protesters took the streets from the miniyapolise several people were arrested.
Protesters were protesting against Donald Trump and his call to stop voting.
Similar protests have taken place in Philadelphia and Chicago. There have also been small protests in Phoenix, Arizona.
New York police say a poster of Joe Biden was set on fire in West Village, near the Washington Square Park area of Manhattan, shortly before 8 p.m. After that the tension spread in the whole area.
Shortly afterwards, another mob set fire to a pile of rubbish on the side of the road at West Fourth Street and Sixth Avenue.
Police tried to remove them from the road. During this time, they had several scuffles with the police. Police later made arrests to bring the situation under control.