British officials are investigating reports today that an al Qaida leader wanted over the July 7 attacks on London has been arrested in Pakistan.
The Arab suspect was among seven militants detained by Pakistani security forces in the city of Peshawar yesterday, sources said.
A Foreign and Commonwealth Office spokesman said: "We are investigating the reports."
Reports suggested the arrested suspect was from Saudi Arabia, but his alleged role in the attacks was not immediately clear.
The July 7 2005 suicide bombings on London's public transport network killed 52 people and injured more than 700.