Police have started arresting protesters at a demonstration against the government’s ban of the campaign group Palestine Action.

Hundreds of people have gathered in Parliament Square in central London, some waving Palestinian flags and chanting “free Palestine”. Others held placards saying: “I oppose genocide, I support Palestine Action.”

Officers have been seen carrying people out of the crowd, after some protesters said they planned to refuse bail and go “floppy” if they were arrested.

The Metropolitan Police had earlier warned that people showing support for the group, which has been proscribed under terrorism law, would face arrest.