Oh crap:
A double decker bus has exploded, and there have been explosions in the London Underground. Initially blamed on power surge, but now it's not really clear.
Update: BBC reports more than 30 dead and hundreds injured, with 4 explosions, one being on a bus and three on the underground. Rumours of an Al-Qaeda claim seem to be unsubstantiated for now, but the BBC have a statement from an Islamist website
. Blair's flying down to London, coming back tonight to continue G8 talks...