Grunnen til at ingen av gårsdagens bomber gikk av, var at de trolig er laget av samme person, og således har den samme feilen. Eller sprengstoffet kan ha tapt seg på to ukers lagring.
Det er liten tvil om at gårsdagens aksjon ble utført av den samme gruppen som 7-7. Også dette skulle vært en selvmordsaksjon. Minst to viste tydelig tegn på forbauselse over at de var i live, etter at detonatorene eksploderte.
Denne gangen var sprengstoffet omgitt av et lag med spiker. London er blitt Jerusalem.
Detectives have established from witness accounts that at least two of the men who carried out the attacks were astonished to be alive after the detonations systems for the explosives failed.
The bomber at Shepherds Bush was startled when the blast from his device merely blew him on to his back, rather than kill him outright. Passengers who saw the explosion said that he appeared shocked that he was able to walk away.
Police sources said that all four detonators were homemade. They said that the detonator used in the attack at Warren Street station consisted of nails packed around explosive.
Police praised three men, believed to be two officers and a member of the public, who tackled the bomber at the Oval, ripping his rucksack from his back and securing vital evidence.