Story Highlights• UK police arrest three men in connection with July 7, 2005, London bombings
• Two held at Manchester airport as they were due to board flight to Pakistan
• Third arrested later at a house in Leeds; police search houses
• 52 people died in the suicide bomb attacks against London transport network
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LONDON, England (CNN) -- Three men have been arrested in connection with the July 7, 2005, terrorist attacks on the London transport network, British police said in a statement.
Two men, aged 23 and 30, were arrested at Manchester airport in northern England shortly before 1 p.m. GMT on Thursday as they were due to catch a flight to Pakistan, New Scotland Yard said.
A third man, aged 26, was arrested shortly after 4 p.m. at a house in nearby Leeds, the statement said.
Police were also searching five houses in the Leeds area as well as a flat and business premises in east London, the statement said.
"The three men were arrested on suspicion of the commission, preparation, or instigation of acts of terrorism under the Terrorism Act 2000," it read.
The three were being taken in custody at a central London police station where counter-terrorism officers were waiting to interview them.
Fifty-two people -- as well as the four bombers -- died and more than 700 were injured in the 2005 bombings aboard three London Underground trains and a bus during morning rush hour.
Three of the bombers -- Mohammed Sidique Khan, 30, Shehzad Tanweer, 22, and Hasib Hussain, 18 -- came from the Tipton area of Leeds. The fourth, Jamaican-born Jermaine Lindsay, 19, was raised in southern England.
"We are determined to follow the evidence wherever it takes us to identify any other person who may have been involved, in any way, in the terrorist attacks," the police said.
Chief Superintendent Mark Millsom of West Yorkshire Police said described operations surrounding the arrests and searches as "low key."
"We haven't involved any armed officers, we haven't had to close off any streets," he said in a television interview.
Only one other person has been detained previously in investigations into the London bombings, but he was released.
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