Fifty-five people have been arrested at a rally for the banned Palestine Action group outside Britain’s parliament, Reuters reports quoting London’s Metropolitan Police.

The crowd in Parliament Square had been waving placards supporting the group that was banned this month under anti-terrorism legislation, the force said in a post on X.

People from the rally, some wearing black and white Palestinian scarves, were taken away in police vans.

British lawmakers proscribed the group earlier this month after some of its members broke into a Royal Air Force base and damaged planes in protest of Britain’s support for Israel. Membership of Palestine Action now carries a prison sentence of up to 14 years.

The group has called the decision “authoritarian”, and a challenge to the ban will be heard at London’s High Court on Monday.