In a BBC radio interview, Blair said investigators did not yet know who was behind the attacks but hoped to have more information soon.
He said he was aware of a claim of responsibility posted on the Internet by a group calling itself "The Secret Organization of al-Qaida in Europe."
He said that it was "reasonably obvious that it comes from that type of quarter" but not yet clear exactly which organization was responsible.
A second claim appeared on a Web site yesterday, this one signed Abu Hafs al-Masri Brigades. The group, whose name evokes the alias of Mohammed Atef, Osama bin Laden's top deputy who was killed in a US airstrike in Afghanistan in November 2001. But experts say the group has no proven track record of attacks, and that it has claimed responsibility for events in which it was unlikely to have played a role.
At King's Cross station, near the site of the deadliest of the three subway bombings, the rail service was partially restored yesterday. Flowers and sympathy cares piled up outside honoring the dead.
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