The bombs in the trains went off seconds from each other, so they we're probably timed. 50+ dead, 700 were injured, 350 treated at the scene, 350 hospital treatment and 100 at critical level or something like that.
Yes, someone who just went off the bus before it exploded seconds later saw a very nervous man at the back who was constantly fiddling with his briefcase, picking it up and putting it down and so on. As Fairy said, it would have been stupid to get killed, but what if the bomb went off early. That does happen too. No idea about those Italy people.
UPDATE
They've finally made it to the train which was stuck in rubble. Hope someone has survived.