London police said Sunday that 532 people were arrested the previous day when supporters of a pro-Palestinian group that was recently outlawed as a terrorist organization intentionally broke the law.

Critics say ban on activist group stifles freedom of speech and assembly and aims to curb pro-Palestine demonstrations.

British police said they arrested 365 people in central London on Saturday as supporters of a recently banned pro-Palestinian group intentionally defied the law as part of their effort to force the government to reconsider the ban.