More than 160 people were arrested after a weekend of rioting and looting across London.
Groups of young people looted shops attacked police officers, and set fire to vehicles.
The violence began Saturday night in the north London suburb of Tottenham due to anger over a fatal police shooting of Mark Duggan.
But some in England say the riots expose deep tensions after economic uncertainty and sharp cutbacks in public aid.
"It's nothing to do with the man who was shot, is it?" said 37-year-old Marcia Simmons, a life-long resident of Tottenham. "A lot of youths ... heard there was a protest and joined in. Others used it as an opportunity to kit themselves out, didn't they, with shoes and T-shirts and everything."
Thirty-five police officers were injured trying to contain the rioting.
Police commander Christine Jones said officers were "shocked at the outrageous level of violence directed against them."
Law enforcement officials say copycat violence has since spread.
"We will make sure that this criminality is not allowed to continue," police deputy assistant commissioner Steve Kavanagh told Sky News.