Caught on camera: Police urge fans to turn in soccer thugs from Leeds - Manchester clash

The violence at the Carling Cup tie at Elland Road on September 20 saw missiles hurled between both sides and police officers taken to hospital.

Det Supt David Pervin of West Yorkshire Police said: “Leeds United, Manchester United, the community and the police do not want people prepared to behave like that in football. There is no room for them.”

24 people were arrested after the match and 14 face violence charges. But other offenders have been pinpointed by detectives after combing through hundreds of hours of CCTV footage.

“Now it is time for the public to identify them,” said Det Supt Pervin.

“If you know these people call 101 or text 88010 starting with the keyword ‘United’ or ring Crimestoppers anonymously on 0800 555 111. Don’t let them do it again.”

The initial arrests followed widespread condemnation of the violence before, during and after the Carling Cup match, which Leeds lost 3-0. Leeds chairman Ken Bates was among those who criticised those responsible.

Officers had previously handed a fixed penalty notice to a 23-year-old man has for being drunk and disorderly and official reprimands two 16-year-old boys for Public Order offences.

Four men who were arrested on suspicion of “making off without payment” were later released without charge but one was given a police caution for a Public Order offence.

Supt Vernon Francis of West Yorkshire Police said at the time that some Leeds and Manchester fans had turned up intent on causing trouble.

He said: “This has nothing to with rivalry between fans. Officers and members of the public came under missile attack before and after the game, by people who had turned up with one thing on their mind.

“The behaviour of some of those inside the stadium during the match was disgraceful.”

Despite a major police operation, pockets of disorder broke out before the match. In one incident outside the ground, an officer suffered a broken leg after being knocked to the ground and under the feet of a police horse. He is currently detained in hospital. Another officer sustained a foot injury.

During the game a red smoke bomb was discharged in the away section, and later a Galatasary flag was displayed - a reference to the murder of two Leeds fans in Istanbul in 2000.

A number of spectators were injured, one of whom was knocked unconscious. He has since been treated and discharged from hospital.

Supt Francis said: “Our officers witnessed some appalling behaviour. It was shocking to see people of all ages taking part in the violence, some who had young children there with them.

“It’s not the sort of behaviour genuine fans or the people of Leeds as a whole want to see. It’s simply not acceptable and anyone who was involved, wherever in the country they live, can expect a knock at the door.

“We will exhaust every avenue to identify these people and will look at bring them before the courts and using other powers such as Football Banning Orders against them”