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 (DFLA) 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.
A blimp in the shape of Boris Johnson had been set to fly at the March for Change, scheduled to begin in London at 2pm.
However after the altercation with the DFLA, March for Change organisers told the PA news agency the blimp would not fly as it was likely to become a target.
Tom Brufatto, one of the directors of the March for Change, said: “We are here to demonstrate peacefully and defend our democracy.
“We have been attacked three times. We respect people’s right to protest but we do not respect people’s rights to intimidate and be aggressive.
“It’s very disappointing that because of the aggression we have received today even before getting started, we have had to send the Boris blimp home because we feared it was going to be used as an excuse for violence against our supporters.
“We hope that despite the disruption that we are still able to prove an interesting and big event for our supporters.”
The March for Change event is set to feature several speakers, including MP Anna Soubry and Peter Tatchell.
Across the UK and Europe, 35 other events are being held at the same time, including a pro-democracy protest in Berlin.
We need your help to keep speaking the truth
Every story that you have come to us with; each injustice you have asked us to investigate; every campaign we have fought; each of your unheard voices we amplified; we do this for you. We are making a difference on your behalf.
Our fight is your fight. You’ve supported our collective struggle every time you gave us a like; and every time you shared our work across social media. Now we need you to support us with a monthly donation.
We have published nearly 2,000 articles and over 50 films in 2021. And we want to do this and more in 2022 but we don’t have enough money to go on at this pace. So, if you value our work and want us to continue then please join us and be part of The Canary family.
In return, you get:
* Advert free reading experience
* Quarterly group video call with the Editor-in-Chief
* Behind the scenes monthly e-newsletter
* 20% discount in our shop
Almost all of our spending goes to the people who make The Canary’s content. So your contribution directly supports our writers and enables us to continue to do what we do: speaking truth, powered by you. We have weathered many attempts to shut us down and silence our vital opposition to an increasingly fascist government and right-wing mainstream media.
With your help we can continue:
* Holding political and state power to account
* Advocating for the people the system marginalises
* Being a media outlet that upholds the highest standards
* Campaigning on the issues others won’t
* Putting your lives central to everything we do
We are a drop of truth in an ocean of deceit. But we can’t do this without your support. So please, can you help us continue the fight?