NEW YORK/LONDON, Aug 4 (Reuters) - Bombs used by four suicide attackers to kill 52 people in London were made from simple ingredients such as hair bleach, and three of them were probably set off by cellphones, New York's police chief said. (London Bombers Used Everyday Materials, Reuters)

There's a theory that the London bombers of July 7 weren't suicide bombers but dupes - they were blown up.  (Police debate if London Plotters were Suicide Bombers, or Dupes, NYT 07/26) The theory stems from the lack of classical suicide bomber MO's - leaving a note/video, not having any return traces (the guys had a car parked as well as return train tickets purchased).  Now that cellphones are implicated as the timing device, it seems to give credence to the theory that they were blown up not by a time of their choosing, but on someone else's schedule.  There's also a bit of flak between the NYC police department and London's PD, since the info about the constitution of the bombs and the cellphones were revealed in confidence by London to NYC.