Al Qaeda leader Ayman al-Zawahiri, in an online audio message, pledged allegiance to the new head of the Afghan Taliban in a move that could bolster his accession after the death of Taliban founder Mullah Mohammad Omar. "We pledge our allegiance ... (to the) commander of the faithful, Mullah Mohammad Akhtar Mansour, may God protect him," said Ayman al-Zawahiri, believed to be hiding in a border area between Afghanistan and Pakistan that is a militant bastion.