Police officers were pelted with bottles during an anti-lockdown protest in central London despite restrictions being lifted.
Thousands of people gathered Parliament and blocked roads on 'Freedom Day'.
Activists chanted "shame on police" and "arrest Boris Johnson" during the gathering.
Met Police tweeted: "We are responding to a demonstration in Parliament Square this afternoon.
"A group have blocked the road which is causing traffic disruption.
"Officers are on scene, speaking with those taking part in the protest and looking to ease congestion as soon as possible."