Footage from yesterday's Million Mask March shows protesters chanting and singing in Trafalgar Square, London. <br /><br />The Million Mask March happens every year and features thousands of people dressed in V For Vendetta (Guy Fawkes) masks, who protest against various social injustices. <br /><br />The masks are also associated with the loose hacking collective Anonymous, who organised this year's event to protest against austerity and the surveillance state. <br /><br />This year's march began peacefully in Trafalgar Square but by the end of the night at least 30 people had reportedly been arrested and several police officers had been injured.
