New disturbances have been reported in London this evening and a number of youths have been arrested.
The incidents, which have mainly taken place around the Enfield area, come after riots took place in the city last night.
55 people were arrested after street violence in the Tottenham area of North London.
26 officers and three members of the public were injured and a number of shops were set on fire and looted during the disturbances.
Petrol bombs were thrown at police and at patrol cars and a double-decker bus and numerous shops were set on fire.
The riots erupted following a peaceful protest over the fatal shooting of a 29-year-old father-of-four by police on Thursday.
Scotland Yard said the people were arrested for offences including violent disorder, burglary and theft.
Trouble flared after members of the community took to the streets last night to demand ‘justice’, after Mark Duggan was shot dead by police on Thursday.
Fire engines descended on the area and thunderflashes were thrown at police on horseback.
After sections of Tottenham High Road were cleared of protesters, ‘pockets of trouble’ continued to flare in nearby areas, a Scotland Yard spokesman said.
There were also reports of looting in Tottenham Hale Retail Park.
Political condemnation
Responding to last night's scenes of violence, a spokesman for the British government said: ‘The rioting in Tottenham last night was utterly unacceptable.
‘There is no justification for the aggression the police and the public faced, or for the damage to property.
‘There is now a police investigation into the rioting and we should let that process happen.’
Other senior political figures also condemned last night's unrest.
Home Secretary Theresa May said: ‘I condemn utterly the violence in Tottenham last night. Such disregard for public safety and property will not be tolerated, and the Metropolitan Police have my full support in restoring order.
‘I want to pay tribute to the officers who put themselves in harm's way.’
Mayor of London Boris Johnson said: ‘I'm appalled at the scenes of violence and destruction in Tottenham.
‘The Acting Commissioner has assured me that the police are doing everything they can to resolve this situation. The events leading to these disturbances are rightly being investigated by the IPCC.
‘Harming people and property will do nothing to facilitate the investigation, it will only make the situation worse.’
Victim's family seek 'justice'
A family friend of Mr Duggan, who gave her name only as Nikki, 53, said the man's friends and relatives had organised the protest because ‘something has to be done’ and the marchers wanted ‘justice for the family’.
Some of those involved lay in the road to make their point, she said.
‘They're making their presence known because people are not happy,’ she added. ‘This guy was not violent. Yes, he was involved in things but he was not an aggressive person. He had never hurt anyone.’
Commander Stephen Watson of the Metropolitan Police stressed that ‘a significant number of police officers’ had been deployed to the scene, telling BBC News: ‘Our people are very well trained and led. We are exercising contingency plans which are well rehearsed.’
He added: ‘Our intention is to restore calm and normality to the area as soon as possible.’
He said there would be arrests for criminal offences, but that they came second to preserving public safety.
Last night's troubles evoked memories of 1985, when a police officer, PC Keith Blakelock, was hacked to death following a riot in Broadwater Farm, where the marchers set off yesterday.
