Thousands of masked protesters descended on central London on Saturday night for the Million Mask March, an annual global anti-capitalism and pro-civil liberties demonstration.

Wearing characteristic Guy Fawkes masks, supporters of hacking collective Anonymous crowded into Trafalgar Square with scores of police on hand to keep order. The protest passed off without major incident, though by 10.45pm police had made 47 arrests, the majority for drug offences and obstruction of officers.

Ugly scenes marred last year’s march, which saw four officers injured by missiles and fireworks that were thrown at them.

Scotland Yard imposed restrictions on this year’s event amid concerns over any repeat of the disorder, limiting the march to three hours between 6pm and 9pm on a route between Trafalgar Square and Whitehall.

Million Mask March: police curb protests amid fears of violence
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Nearly 20,000 people had indicated they would attend on the event’s Facebook page, which warned “the police are not your friends”.

The protest began peacefully, with several participants climbing the base of Nelson’s column and chanting the slogan “one solution, revolution”. The procession headed along Whitehall and there were angry scenes as police formed a ring of steel outside parliament.