Thousands of police officers will be on the streets of London later after three nights of rioting.
Forces from across the country are sending officers to the capital to support the Metropolitan Police, which will have 16,000 officers on duty.
Police across England are gearing up after trouble spread to Birmingham, Bristol, Liverpool and Nottingham.
More than 600 people have been arrested and police have begun releasing footage of people they want to question.
A 26-year-old man shot in his car in Croydon during last night’s rioting has died and a murder hunt is under way. Police have not confirmed whether the shooting was linked to the riots.
Copycat activity
On Monday night hundreds of people attacked and looted shops in four cities across England in what police called “copycat criminal activity”.
There were smaller disturbances in the Medway towns in Kent and also in Leeds.
There was a third night of violence in London after trouble started on Monday afternoon in Hackney.
Violence began in Tottenham on Saturday over the fatal shooting by police of Mark Duggan.
His family released a statement which said they were “deeply distressed by the disorder affecting so many communities across the country”.
David Cameron visited Croydon to see the damage caused in Monday’s riots
All leave has been cancelled for police officers in the capital after another night when shops were looted and buildings set alight.
So far 525 people have been arrested in London and about 100 people have been charged, police have said.
On a usual Tuesday night there would be less than 3,000 police officers on patrol.
The Association of Chief Police Officers said 30 forces have sent officers to the capital including North Yorkshire, Humberside, Lincolnshire, Kent, Sussex and Surrey.
A spokesperson for Kent Police said they had been sending 30 to 50 officers to London every 24 hours.
‘Simply inexcusable’
The prime minister has recalled Parliament in the wake of the continued unrest.
David Cameron returned early from his summer break to chair a meeting of the emergency Cobra committee in Downing Street on Tuesday.
Met Commander Christine Jones described the violence as “simply inexcusable”.
All Met police cells in London are full and some of those arrested are being taken to surrounding forces.
London Fire Brigade said fires on Monday had spread “almost pan-London” and it faced its “busiest night in recent history”.
