A male relative of one of the four London bomb suspects has been arrested in Yorkshire after the identity of the suspected London bus bomber led police to make a series of raids.
Armed police surround a property in Leeds in northern England today in connection with the July 7 London bombings
Deputy Assistant Commissioner Peter Clarke, Anti-Terrorist Branch said CCTV had identified the four men they believed to have been the bombers, three of whom are believed to have come from West Yorkshire.
Forensic evidence suggests that one of these men died in the Tube blast at Aldgate. It is thought at least two of the other bombers died in the blasts.
Mr Clarke said personal documents bearing the names of three of the four men had been found close to the seats of three of the blasts.
Police believe the four bombers were British nationals and all died in Thursday's bombings. The pace of the anti-terror investigation increased swiftly after a series of raids in the Leeds area and the seizure of a car at Luton rail station.
A second car was tonight being examined in Leighton Buzzard in connection with the terrorist attacks on, Bedfordshire police said. Sky News reported that explosives have been found in this vehicle.
Earlier today armed police took up positions outside a house in Leeds today during the series of anti-terror police raids. One of the men from West Yorkshire had been reported missing by his family and his property was found at the bus blast scene.
The second man's property was found at the scene of the Aldgate blast and the third man's property at both the Aldgate and Edgware Road blasts.
Officers were seen outside the property in Hyde Park Road, Burley, minutes after what was reported to be a controlled explosion. It is believed the explosion was used to gain entry to the property.
The action was part of a series of raids in the West Yorkshire city during an operation that Metropolitan Police Commissioner Sir Ian Blair said was directly linked to the London bombings. Sir Ian described the operation as "significant".
"There have been a series of searches carried out in Yorkshire. Those searches are still going on. There's very little else I can say at the moment, but this activity is directly connected to the outrages on Thursday," he added.
Neighbours at one of the addresses reported that the 22-year-old man who lived there with his family had gone missing.
Police hunting the bombers initially raided five homes in Leeds. The address in Hyde Park Road was not thought to be one of the first five addresses.
At least 52 people died in the simultaneous bomb attacks on the British capital's public transport system during last Thursday's rush hour. This figure is expected to rise as police recover bodies from the scene of the worst attack near Russell Square Tube station.