BBC NEWS | UK | Multiple blasts paralyse London: "Large numbers of casualties have been reported after at least six explosions on the Underground network and a double-decker bus in London. UK Home Secretary Charles Clarke said several explosions in central London had caused 'terrible injuries'."Frank Gardner of BBC is reporting that Arab sources say the blasts were probably the work of al-Qaeda. London's police chief said traces of explosive had been found at one site. Sir Ian Blair and Scotland Yard said there had been at least six explosions reported at Edgware Road, King's Cross, Liverpool Street, Russell Square, Aldgate East and Moorgate.