Anti-vaccination protestors clashed with police as they tried to storm the Medicines and Healthcare Products Regulatory Agency (MHRA).
Four officers were injured during chaos unfolding in central London, the Metropolitan Police has said.
The force said a number of protesters had “become violent” towards police during action in the capital.
In a tweet, Scotland Yard said: “A number of protesters have become violent towards police. Four of our officers have been injured during clashes.
“This is unacceptable. We remain on scene. Updates to follow.”
Security guards were seen holding the revolving doors shut as protesters dressed in black tried to charge at the glass.
The Metropolitan Police, who were nearby after an Extinction Rebellion protest, managed to swoop in and block the entrance to keep the crowd at bay before they were dispersed back to Canary Wharf.
Police fight and stop with pro choice freedom protesters get in to the Medicines and Healthcare Products Regulatory Agency (MHRA) building as they make decisions on children getting vaccinated, 20 Cabot Square, Canary Wharf, London pic.twitter.com/ppKSy0AtTs
— Paul Brown 🇬🇧 Browns fan🏈 London News 🎥Vlogger (@PaulBrown_UK) September 3, 2021
Protesters were seen almost inside the building before police arrived and kept them back in violent skirmishes captured on social media.
The MHRA is the government body responsible for approving the coronavirus vaccine.
A Met spokesman said: “We have officers attending a demonstration outside a commercial building on Cabot Square in Canary Wharf. A number of officers are on scene, guarding the entrance to the building.
“Officers also continue to attend a demonstration by a separate group in Canary Wharf along Bank Street. Arrests have been made and units remain on scene.”
The protest comes ahead of the decision the government will not extend Covid vaccinations to 12- to 15-year-olds,
Protesters in London try to storm the MHRA HQ in Canary Wharf, London.
I had a feeling this was happening today 👊 pic.twitter.com/P45PFghWKV
— Chrissy 🌸 🌸🇬🇧 🇺🇸 (@Chrissy_2697) September 3, 2021
The Joint Committee on Vaccination and Immunisation (JCVI) has announced it is widening the so-far limited rollout to more children in this age bracket who have underlying health conditions.
But it is not recommending mass vaccination of children aged between 12 and 15.
The programme is being extended from what had been considered the most at-risk children, to include children with chronic major heart, lung, kidney, liver and neurological conditions.
It means about 200,000 more children will be invited for vaccines.
The Joint Committee on Vaccination and Immunisation (JCVI) held a long discussion on the issue on Thursday followed by a vote.