Theresa May, home secretary, speaking on BBC Breakfast, pledges to deal with the growing violence:
"These have been the worst scenes of violence and disturbance on our streets for many, many years, and this sort of violence, this level of criminality, this thuggery, this looting, this theft, is completely unacceptable.
"We can deal with it. We can deal with it with robust policing, with good use of intelligence, but also with the help and support of local communities.
"If there's anybody who knows somebody who was out on those streets last night and involved in this action then they should tell the police."