The BBC seems to have an endless supply of security experts. I watch them, one after another, day after day and I never see the same one twice.

Tonight’s was questioning the idea the bombers were intending to die in the blasts. They brought credit cards and driving licenses with them - not usual for people who are expecting to die soon. There was explosive remaining in their car - suggesting, perhaps, they had somewhere else to attack afterwards?

None, so far as is known, have left any kind of message for family or friends - as is usual with suicide bombers.

So the suggestion is that they believed the bombs were on timers but were told they would explode later than they actually did.

This might explain why one was killed on a bus instead of being underground. Maybe, believing he had time, he was on his way somewhere….

And one bomber is unaccounted for. Did he just dump his bomb and run? If he did I bet he’s absolutely seething with whoever set them up. Maybe he’ll spill the beans if he’s caught….