Eleven men were arrested and a policewoman was taken to hospital Saturday after violence broke out at a far-right group's demonstration against Islamic extremism in central England, police said.

The 29-year-old policewoman hurt her arm while policing a cordon at the protest by the English Defence League in the city of Nottingham, but no one else was seriously hurt in the skirmishes, Nottinghamshire police said.

About 500 members of the EDL, a marginal group which has staged a number of demonstrations against radical Islam in recent months, sang the English national anthem and football songs as they gathered in the city.

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