Police have condemned a wave of copycat criminal activity across London in a second night of looting and disorder following riots in the northern suburb of Tottenham.
A peaceful protest over the fatal shooting by police last Thursday of 29-year-old Mark Duggan descended into violence at the weekend.
The Metropolitan Police says officers have been attacked and a number of police vehicles damaged on Sunday, the BBC reports.
A Footlocker shop in Brixton, south London, was set on fire and other nearby stores were looted.
Three officers were hurt when a vehicle hit them as they tried to make an arrest in Waltham Forest, east London.
Disorder has also been reported in Enfield, Walthamstow and other parts of the capital.
There have been reports of a gang of up to 200 youths looting shops and charging police in Coldharbour Lane and the High Street in Brixton, south London.
On Saturday, more than 40 people were arrested after a riot began about 8.20pm local time.
Petrol bombs were thrown, reducing many buildings and vehicles to charred wrecks. A double-decker bus, two police cars and a carpet shop were among the vehicles and buildings destroyed. London Fire Brigade said it attended 49 fires in the area.
The Independent Police Complaints Commission is investigating Thursday's shooting. A police officer was also shot in the incident.
The Met has warned about ''ill-informed speculation'' on social networking sites of further problems.