One of the men sentenced to nine months in jail was 19-year-old Adam Rowley, from Woking in Surrey.

Police are still looking for some people

The Old Bailey heard that he ripped off the blue lamp from a fire brigade vehicle as it raced to the rescue of a woman whose leg had been crushed under a police van.

During the Stop the City anti-capitalism riot on 18 June, Rowley was also seen confronting police lines, about to throw a rock.

He was later seen with a stick in his hand and carrying a door used in a barricade. Rowley admitted violent disorder and theft.

Nicholas Pyne, 26, from Guildford, Surrey, was also jailed for nine months after he admitted violent disorder.

Photos have been published on the internet

Pyne was filmed as mounted police tried to disperse demonstrators. The court heard that he was seen throwing a can of beer at an officer, and later at the head of a horse whose woman police officer rider was pulled off by others.

The third man, Steven McNally, 19, a drama student from Woking, Surrey, received 150 hours' community service after also admitting violent disorder.

The Common Serjeant of London, Judge Neil Denison, said McNally had been on the fringes of the violence, rather than a ringleader, and was drunk.

By the end of the demonstration, during which about 6,000 protesters poured into the Square Mile, damage worth £2m had been caused, with 28 police and 14 members of the public injured.

Police hope members of the public will recognise those they want to identify

It was the capital's worst disturbance since the Trafalgar Square poll tax riots nine years ago.

A total of 71 people have been arrested in connection with the riot, and police are looking for more than 200 others suspected of being involved.

On Friday they announced that they had made eight arrests after using the internet to post images of protesters they were looking for.