Police have issued CCTV images of four suspected suicide bombers who tried to bring more death and carnage to London.

A fifth suspect was shot dead by police at a Tube station but members of the terrorist cell were still on the run last night and are bent on carrying out further attacks, detectives believe.

In a further development, one man was arrested last night in connection with the police investigation in Stockwell, south London, close to where the fatal shooting happened.

Police think the four men pictured on closed-circuit television footage were responsible for rucksack bombs found on underground trains at the Oval, Warren Street and Shepherd's Bush Underground stations and on a number 26 bus in Shoreditch on Thursday.

None of them detonated properly and there were no serious injuries, but the strategy for the attacks was an almost exact replica of the July 7 attacks that claimed the lives of 56 people.

The first image showed a man in a black sweater with "New York" on it running away from the Northern Line at Oval station at 12.34pm on Thursday. The sweater was later found in Cowley Road, Brixton.

A second image showed a man on the top deck of the number 26 bus. He was wearing a grey T-shirt with a palm tree design, a dark jacket and a white baseball cap.

Another image showed a suspect leaving Warren Street at 12.39pm on Thursday and the fourth was of a man at Westbourne Park station at 12.21pm.

Scotland Yard Assistant Commissioner Andy Hayman warned the public not to approach the men under any circumstances and to ring 999.

The fatal shooting at Stockwell happened at 10am yesterday when armed plain-clothes police officers shot a man they believe was an accomplice of the bombers. He was killed as he tried to board a train at the Underground station.

It was understood the man had come out of a house police had under surveillance. Officers followed him, hoping he would lead them to the bombers. When he went into the station, they told him to stop.

The Asian man ran down an escalator and tried to get on a train before he was shot in the head.

Outside the station, train passenger Mark Whitby said: "He sort of tripped but they were hotly pursuing him and couldn't have been more than two or three feet behind him at this time."

Train drivers union Aslef said that at one point during the chaos the train driver had a gun held to his head by police.

Steve Grant, the union's London officer, said police had since apologised.

Although the dead man was not one of the four suspected bombers, Scotland Yard Commissioner Sir Ian Blair said the shooting was directly linked to anti-terror operations.

The shooting came as a statement posted on an Islamic website in the name of an al Qaida-linked group, Abu Hafs al Masri Brigade, claimed responsibility.

They also claimed responsibility for the July 7 bombings.

The statement's authenticity could not be immediately verified.

Last night, a man was arrested under anti-terror laws at Snow Hill railway station in Birmingham.

West Midlands Police said later the man had been interviewed by officers but was not facing any criminal charges.

In the capital, police also carried out raids in Portnall Road, West Kilburn, and in the Dorset Road area of Stockwell.

* Three people were arrested yesterday after an attempted arson attack at the Aylesbury, Buckinghamshire home of suicide bomber Germaine Lindsay. Officers were called yesterday morning after reports of a strong smell of petrol in the street.