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.

Average age of those arrested was 54, and the most arrests — 147 of them — are of people aged between 60 and 6

British police said they arrested 365 people in central London on Saturday 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.