Police in Tottenham, north London, were trying to restore order after overnight clashes in which petrol bombs and other projectiles were thrown at police and patrol cars, a bus, and buildings were set on fire following reports a man was shot to death in a gun battle with police.
Eight police officers were injured in the weekend violence and taken to the hospital. At least one was reported to have suffered a head injury.
No arrests were reported as police said restoring public safety was their first priority. Pockets of trouble were still being reported.
The initial protest was organized on August 6 by the friends and family of Mark Duggan, 29, who was shot dead after a reported exchange of gunfire with police.
Duggan had been in a taxi when it was stopped by armed officers as part of a pre-planned operation. One policeman escaped unhurt after a bullet struck his radio. Duggan's death is being investigated by the independent police watchdog.
But the situation spun out of control after the peaceful protest, resulting in televised scenes of violent clashes.
Tottenham is one of the most deprived areas in all of England, with nearly half of all children living in poverty, according to campaigners.
The area is diverse, with a history of racial tension and anti-police sentiment.
compiled from agency reports