Detectives today released another six photographs of Bradford riot suspects as the latest step in Britain's largest criminal investigation.

Officers heading Operation Wheel - the police inquiry into the July 7 disorder - have now published 212 pictures in the Telegraph & Argus of those wanted for questioning.

Detective Inspector Chris Binns, of Operation Wheel, said: "At the height of the riot, it is estimated that the crowd was about 2,000 strong, but that there were only about 500 actually offending."

"We feel that by the end of this investigation we will have identified the majority of those people and that they will have been brought to justice, most certainly the main ring leaders."

He paid tribute to the public's role in the campaign, adding: "Together the people of this wonderfully diverse city, from all backgrounds, ethnicity's and religions, have joined together to condemn the rioters and help the city to recover."

"The public's help in naming those involved in the terrible events of that night has been nothing short of inspiring."

But he appealed for people to maintain their support to ensure the culprits - who caused millions of pounds of damage and injured more than 300 police officers - were brought to justice.

"Including today's poster we have asked the public to identify 212 people. That means there are now walls full of these photographs in police stations, mosques and schools.

"I can imagine, when faced with that many images, it is tempting to the public to walk on by and not study the photos, but please look carefully at the posters, not only today's but previous ones as well, because there are still people we want to trace."

Det Insp Binns added: "Bradford will get over that terrible night, but let's make sure those responsible are brought to justice so we can put July 7, 2001, firmly where it belongs - in the past."

Anyone who recognises someone in the posters can ring the incident room on (01274) 376915 or the Urdu-speaking language line on (01274) 376916. E-mails can be received at the incident room: bradfordriots@westyorkshire.pnn.police.uk