Suspected hooligans who clashed with rival fans during a pre-season football tournament were in custody today after police carried out dawn raids across Bradford.

An accountant was among nine people arrested as police targeted the homes of soccer yob suspects.

Dozens of officers swooped on up to 20 homes in co-ordinated raids which began shortly after 6am.

The crackdown, codenamed Operation Olive, aimed to detain suspected thugs from Bradford who fought with Aberdeen fans in the city centre during City's Centenary Tournament in July.

More than 100 hooligans were involved in the violence on Ivegate on the afternoon of Saturday, July 26, the first day of the tournament, which was billed as a family event.

Bottles and hoardings were thrown and a police dog was injured when the windscreen of a police van was smashed as officers restored order.

Twelve people were arrested on the day and a further nine arrests were made after more than 20 hooligans from the two clubs brawled in Manningham Lane on the same afternoon.

Today's operation - involving about 60 officers from Bradford, the Operational Support Unit and Task Force - targeted suspects identified from CCTV footage of the violence in Ivegate and film taken of the disorder by police.

Four-strong teams of officers swooped on addresses across Bradford and two in Pudsey and Leeds to detain 14 suspects, mostly linked to the Bradford City hooligan Ointment gang.

The raids included one at a neat, semi-detached house in Wrose, where a shaven-headed man in his mid-20s was led away in handcuffs.

A curly-haired man in his 40s was arrested at a stone-built end terraced house in Allerton.

By mid-morning nine people had been held and inquiries were ongoing to trace five more, with the number of arrests expected to rise. They were being held at Bradford Central police station.

Those detained included an accountant, a builder, a window fitter and a machine operator. They were expected to be interviewed all day and police were hoping to charge and bail them later.

Chief Inspector David Lunn, in charge of the operation, said police would not accept the serious organised violence that took place in Ivegate.

He said: "Our message is that Bradford City football club and West Yorkshire Police will not tolerate such behaviour. It is unacceptable. At the end of the day people have died through football violence. It must stop now."

Chief Insp Lunn said violence had moved away from the grounds to city centres, with a knock-on effect for other people.

He added: "We want Bradford to be a safer place for people to come to and we won't allow football hooligans to disrupt people going about their business."

Seven Aberdeen fans have been identified after West Yorkshire Police sent posters of suspects to Scotland.