Mastermind ‘may have instructed more bombers’

Now the police know the identities of the four suicide bombers, the search is on for the mastermind behind the bombings.

Security experts said the first suicide bombers to hit western Europe would have received training and direction from a more senior Islamist militant.

That raised the prospect that a master bomb-maker was still at large and prompted questions about whether future suicide bombers had already been armed and instructed.