Mohammad Sidique Khan, is seated on the floor, leaning against a wall carpet and justifying, in English, his decision to blow himself up to kill innocent people on a Tube at Edgware Road.

Then a separate message from a much older man follows. Ayman al-Zawahiri, the second in command in the al-Qaeda network, pledges in Arabic, that the war he is waging has now decisively moved to the west.