LONDON: London’s police service said Sunday that officers had arrested 522 people the previous day for breaching anti-terror laws by supporting the recently proscribed group Palestine Action.

In an update to its previous arrest tally, the Met said all but one of those 522 arrests took place at a Parliament Square protest and were for displaying placards backing Palestine Action.

The other arrest for the same offense took place at nearby Russell Square as thousands rallied at a Palestine Coalition march demonstrating against Israel’s war in Gaza.

The 522 total is thought to be the highest ever recorded at a single protest in the UK capital.

The Met made 10 further arrests, including six for assaults on officers, though none were seriously injured, it added.