A topless protester ran past the crowd at the Windsor Castle and shouted "save the planet" after a minutes silence was held for Prince Philip, the Duke of Edinburgh and husband of Queen Elizabeth II, who is being laid to rest at the palace on Saturday in a small family affair due to the Covid-19 restrictions.
The woman appeared to try and break through the security barriers, the dpa news agency reported.
Others at the scene said she jumped onto a nearby statue of Queen Victoria.
The protester was placed in handcuffs by the police and has been seen being removed from the site.
(With inputs from IANS)