Muriel Bowser said on Monday she feared the US was descending into a 'race war' after a violent weekend of clashes

Since Thursday, there have been 69 arrests in Washington DC relating to the riots

Police Chief Peter Newsham said on Monday 70% had come from other cities

He said the FBI was now helping them probe possible domestic terror groups

One man who was arrested on Saturday night in DC has also been arrested twice in Portland

Jeremy Vajko, 27, was dragged from his graffiti-sprayed BLM van 

Police said he plowed it through a crowd of protester at 1.15am on Sunday 

The same van has also been spotted in Kenohsa, but he is from Washington state

Vajko says he is peaceful and was driving at 5mph and giving out medical aid