Al Qaeda are almost as crap at terrorism as the UVF the Loyalist terrorists who always seemed to go into a Catholic betting shop & open fire, only for the guns to jam.
According to one Ivan McCracken, who was on the train and spoke to a first-hand witness,
a man was carrying a rucksack and the rucksack suddenly exploded. It was a minor explosion but enough to blow open the rucksack.
The man then made an exclamation as if something had gone wrong.
This is odd. It looks like none of the bombs even contained any explosives, but, if the report I quoted above is accurate, it also looks like at least one of the bombers expected a huge explosion and was surprised by his own non-suicide. Let's hope they can keep up this level of comical ineptitude. Or alternatively, let's hope MI6 can keep up a brilliant line in selling fake explosives.