Occupy prevented from setting up Parliament Square camp 22 November 2014 Last updated at 05:07 Activists from the Occupy London protest group have been stopped by police from setting up a camp on Parliament Square. Members of the group had gathered for the start of a three-day demonstration. The Metropolitan Police said organisers had "failed to engage" with the force and used Public Order Act powers to make the demonstrators remove masks. In February 2012, Occupy members were evicted from outside St Paul's Cathedral after four months. Under the Police Reform and Social Responsibility Act 2011, protesters are prohibited from setting up camp in Parliament Square. The law was introduced following a long-running anti-war protest in the square outside Parliament. Last month there were a series of clashes with police in the square opposite the Houses of Parliament as Occupy supporters stayed there for nine days. They said they were demonstrating in defence of civil liberties and the right to protest. Occupy, which is part of a global protest movement, says on its website it is seeking a political and economic system that puts people, democracy and the environment before profit. Proportionate action About 100 Occupy protesters gathered in Parliament Square at about 18:00 GMT on Friday. But on this occasion, its protesters were met by dozens of police officers and fencing around the square, preventing them from entering. The ensuing stand-off caused disruption to traffic during Friday rush-hour and there were some scuffles with police, as officers moved the protesters on. They later returned to Parliament Square, and about 80 activists gathered on a pavement area outside the Supreme Court. About 30 pledged to stay there overnight. John Sinha, one of the organisers of the Occupy movement, contended that the police "probably have no legality in enforcing" the blockade of Parliament Square. The Metropolitan Police said it had put "an appropriate and proportionate police plan in place" for the event and the protesters were told they were banned from camping. A Section 60 AA order under the Criminal Justice and Public Order Act 1994, giving officers powers to force people to remove masks where they anticipated criminal activity, was brought in and will remain in place until 14:00 GMT. A police spokesman said there had been no arrests. Have you been affected by recent events around Parliament Square? You can share your experience by emailing haveyoursay@bbc.co.uk If you are willing to be contacted by a BBC journalist, please leave a contact number. Or you can upload here. Read the terms and conditions.