Two groups of pro and anti-Brexit protesters have clashed on Parliament Square.
About 200 people joined a pro-Brexit demonstration organised by the Democratic Football Lads Alliance on Saturday morning.
When members of the anti-Brexit group March for Change began to set up for a rally of their own, some members of the DFLA approached and began shouting.
A beer can was thrown towards about 10 people from the March for Change protest, before police on horseback intervened.
Police knew about both protests prior to Saturday.