Excerpt:
Gangs of youths attacked police officers after an anti-racist march in east London, Scotland Yard said.
Cordons were set up to stop people going up Whitechapel Road because officers feared random attacks on members of the public.
The scenes followed a march, organised by Unite Against Fascism (UAF), that attracted several thousand people.
It was in response to a rally planned by the English Defence League (EDL), but called off earlier this week.