Supporters of the online action group Anonymous have taken to the streets of London to show their support for the organisation.
Hundreds of people have gathered in Trafalgar Square and have marched on parliament wearing masks of Guy Fawkes.
The protesters say they are taking part in the Million Mask March which has seen similar demonstrations in America, Australia and Scandinavia.
Anonymous claim the protest is demonstration of support for their organisation and WikiLeaks.
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