Police are on the streets of Tottenham, north London, where overnight riots saw petrol bombs thrown at police and patrol cars and buildings set on fire.
The incident began after a protest over the fatal shooting of a young man by police on Thursday.
Eight injured police officers have been taken to hospital, at least one of them with head injuries reports the BBC.
About 300 people gathered outside the police station on the High Road on Saturday.
They were demanding ''justice'' after the shooting of Mark Duggan, 29, a father of four.
London Ambulance Service said a total of 10 people had been treated and nine had been taken to hospital.
Two patrol cars were set alight at about 8.20pm BST but officers were not inside at the time.
Shops in the area have also been looted with people seen pushing away shopping trolleys full of goods.
A double decker bus was set on fire at the junction of High Road and Brook Street while a shop on the High Road was also set alight.
One person at the scene, who gave his name as Tim, told the BBC:
''It's an absolute war zone. I saw about five youths, all faces covered up. They set a wheelie bin on fire and threw it into the riot police.''
A BBC television news crew and satellite truck also came under attack from youths throwing missiles.
The youths had begun attacking another police patrol car before the TV crew were targeted and withdrew for their own safety.
The police car was later set alight.
