Judy Woodruff:

Almost 20 years, American embassies in Africa were attacked by al-Qaida, making the terror group's leader, Osama bin Laden, an infamous household name, three years before the horror of September 11, 2001.

During that period, MI6, which is the British foreign intelligence service, had an agent inside al-Qaida. He has now unmasked himself.

And he spoke with Jonathan Rugman of Independent Television News.