Painstaking search for forensic clues

FORENSIC experts yesterday continued the painstaking search for clues to the London bombers.

Spanish experts who helped tracked down suspects in the March 11, 2004, Madrid train blasts have flown in to join the British investigative team, along with Europol specialists.

Investigators say they have already established that the bombers used a high explosive they will not disclose further details and that each device was lighter than 10lb (4.5kg).