AS mentor to Osama bin Laden and the brains behind al-Qaida, Ayman al Zawahri is considered to be one of the world’s most dangerous terrorists.

PAKISTANI troops believe they have surrounded Osama bin Laden's right-hand man during a fierce battle on the wild Afghan border.

As mentor to Osama bin Laden and the brains behind al Qaida, Ayman al Zawahri is considered to be one of the world’s most dangerous terrorists.