A group of Tommy Robinson supporters has blocked off a major road in central London in a tense stand-off with police, who made several arrests.
Hundreds of demonstrators descended on the capital and blocked off the road around Trafalgar Square.
Rows of riot police blocked the gate down the Mall leading to Buckingham Palace, where the Royal Family has gathered on the balcony after celebrating Trooping the Colour just hours earlier.
The protest on Saturday afternoon was the latest in what appears to be a bid to secure the release from jail of the former leader of the English Defence League (EDL).
Supporters chanted "Free Tommy Robinson" and hurled missiles and smoke bombs at police.