It sounds like someone has tried to follow up on the attacks of two weeks ago, with least 3 attempted bombings. Apparently they've bungled it, the bombs didn't go off properly (all three?? how could they f*ck it up so badly?). Most of the details are rumor at this point; one bomber's backpack had a minor explosion, enough to blow it open, leaving the would-be suicide bomber with an "extremely dismayed expression" on his face. Another one dropped his bag on the train and ran off - people tried to grab him but he got away. Something has happened on at least one bus, a small pop upstairs that blew out windows. One of the incidents was at Oval station, so this may be intended to coincide with the opening of the Ashes cricket tournament.
All in all, a weak effort compared to last time. Piss on you, terrorists. The mood here is much closer to annoyance than terror - one weblog commentor says "The tube better be up and running at home time - I haven't got my walking shoes on!"
These people don't deserve to be called terrorists, I hereby dub them annoyists.
(Assuming it turns out nobody was killed, of course)