Police begin a search that is expected to last several days
Police probing the 7 July 2005 terror attacks in London are searching a flat in Leeds, Scotland Yard has said.
The property's tenant is not a suspect but officers believe the site may have been used in the past by those connected to the bombings.
Fifty-two people were killed when four suicide bombers - three of them from Leeds - set off devices on three underground trains and a bus.
The one-bedroom flat is in Shepherd's Lane in the Harehills area of Leeds.
It is located several miles away from the Beeston area, where bombers Mohammed Siddique Khan, Shezhad Tanweer and Hasib Hussein had connections, and the Hyde Park area of the city, where their bomb factory was discovered.
The search of the flat is expected to take several days and officers have also been carrying out house-to-house inquiries in the area.
Police do not believe any of the bombers lived at the flat.
Detectives have renewed their appeal for any information the public may have about the attacks.
Detective Assistant Commissioner John McDowall said: "While it is more than three years since the attacks, this remains a painstaking investigation, and as we have previously said we are determined to identify anyone else who knew what was being planned."
He said an extensive search was being carried out of the flat to see if there were any links with those responsible for the 7 July attacks.
"I would urge anyone who has suspicions about activity in the flat either in the months leading up to the 7/7 attacks or afterwards, to contact police.
"Any information, regardless of how insignificant it may seem, could be important," he added.
I could tell from what they were carrying in that this was more than just a TV licensing raid
The raid took place at around 0700 BST and a few hours later wooden boards were erected around the property.
There have been no arrests.
Landlord Wajid Hussain said he did not want to comment in detail, saying he "didn't know what was going on".
Mr Hussain said his most recent tenants were Polish and that he would have to "check the records" to see who was living there in 2005.
"One of my friends rang me this morning, saying my flat was being raided and that it's linked to London bombings and that's all I know," he said.
One neighbour who gave his name only as Mohammed, said the officers went into the house carrying bags and cameras.
"I could tell from what they were carrying in that this was more than just a TV licensing raid," he said.
Investigators are looking for evidence such as fingerprints or DNA linking the property to the attackers.
Forensic teams will also check for traces of hydrogen peroxide, which - if found - would suggest that the flat may have been used to prepare the explosives.
'Cast a shadow'
Mohammed Siddique Khan, Shezhad Tanweer, and Buckinghamshire-based Jermaine Lindsay set off bombs on tube trains between King's Cross and Russell Square and near Edgware Road and Aldgate on 7 July 2005.
Hasib Hussein detonated a bomb on a double decker bus in Tavistock Square.
Senior officers have always maintained the 7 July bombers had assistance from people with links to al-Qaeda, as they would not have had the technical expertise to make the devices themselves.
Detectives have also said they believe there are people who might have information who have so far remained silent, although the raid is thought to have been prompted by a public tip-off.
Local Labour councillor Mohammed Rafique said the events of July 2005 continued to "cast a shadow over our city".
"The local community and I fully support the actions of the police and I would urge local residents to help in any way they can."
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