Donald Trump has threatened to deploy the military to stop unrest in cities across America - describing the problem as "domestic terror".
The US president addressed the nation from the White House, as police used stun grenades and tear gas to clear surrounding streets.
It was the sixth day of disturbances sparked by the death of an unarmed black man - George Floyd - in police custody in Minneapolis.
A medical examiner has classified his death, as a homicide.
Some demonstrators defied a curfew in Washington last night - with security forces using tear gas and stun grenades to clear the streets.
Donald Trump has described himself as the president of 'law and order':
My fellow Americans - My first and highest duty as President is to defend our great Country and the American People. I swore an oath to uphold the laws of our Nation -- and that is exactly what I will do… pic.twitter.com/pvFxxi9BTR
— Donald J. Trump (@realDonaldTrump) June 2, 2020