London police said Sunday that 532 people were arrested the previous day when supporters of a pro-Palestinian group recently outlawed as a terrorist organization intentionally broke the law to test the government’s ability to enforce the ban.

Police have arrested 466 people in central London on Saturday for protesting the British government’s decision to ban the pro-Palestinian activist group Palestine Action under anti-terrorism laws.

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