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.

Police in London have detained more than 466 people who were protesting the United Kingdom’s decision to ban the Palestine Action Group, marking the “largest ever mass arrest” at a single protest in the British capital, according to campaigners.

Officers made arrests after crowds, waving placards expressing support for the group, gathered in Parliament Square.