Arrest over London bomb attacks
The army has been helping the police with the operation
An arrest has been made in Yorkshire after the identity of the suspected London bus bomber led police to make a series of raids.
Security sources said the bus bomb suspect died in the blast but it is unclear if it was a suicide bombing.
They believe the four bombers were British born and all died in Thursday's bombings.
Police have carried out controlled explosions in Leeds and Luton and searched six houses.
BBC home affairs correspondent Margaret Gilmore said all four bombers were believed to have died in the blasts.
Meanwhile police in Leeds are looking for explosives and have already seized some material.
An unoccupied house in the Burley area of Leeds was one of six raided in Leeds after the attacks. Up to 600 people have been evacuated from the area.
Police cleared people from homes as well as a mosque, a health centre and an old people's home.
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Bomb victim Jamie Gordon's family statement
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Parts of the Beeston area of Leeds has been cordoned off, as well as a street in Dewsbury near the city.
Inspector Miles Himsworth said the operation was being led by the Metropolitan Police Anti-Terrorist officers with the support of West Yorkshire Police and the Army Bomb Disposal Unit.
He said the house at which the controlled explosion took place officers were searching for explosives and other material.
He said that may include computers, and a "careful and meticulous search" would be carried out.
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