A demonstration in London by protestors opposed to capitalism ended with 53 people being arrested.
The Million Mask March, which takes place in a number of cities around the world on 5 November, sees demonstrators wearing so-called Guy Fawkes masks which have also become associated with the anti-establishment comic book figure “V”.
Police said the arrests were made for offences including possession of drugs, criminal damage and public order breaches.
A Metropolitan Police spokesman said most marchers were peaceful but there were “pockets of disorder”.
Fireworks were thrown and a number of people climbed onto the base of Nelson´s Column.
Commander Ben Harrington praised the professionalism and “faultless co-ordination” shown by his officers.
Restrictions had been imposed on the marchers following violence at the event in 2015 which meant a large number of officers were stationed round the Houses of Parliament.