Establishing a connection, at least on the level of method, that many were denying yesterday, and lending credence to this Internet claim of responsibility. From the New York Times, with thanks to Gabrielle Goldwater:
LONDON, July 7 – Investigators searching for clues in the attacks here said Thursday that the three bombs used in the subway apparently were detonated by timers, not suicide bombers, and that a fourth device may have been intended for a target other than the city bus that it destroyed.
Senior police officials said they had not received a message claiming responsibility for the attacks from any group, and had made no arrests. But officials immediately drew parallels between the London bombings and the ones that struck commuter trains in Madrid 16 months ago, which were carried out by a Qaeda-inspired cell.
By Thursday night, there were far more questions than answers confronting Scotland Yard. One official said none of the scores of suspected terrorists being watched closely in England appeared to be involved.
Police and intelligence officials acknowledged that they were taken completely by surprise by the coordinated bombings, even though they had been anticipating a terrorist attack for years.