Al-Qaeda leader Ayman al-Zawahiri has released a video coinciding with the anniversary of the September 11 attacks, confirming for the first time the death of his deputy, US monitors said. In Yemen, troops killed the second in command of Al-Qaeda, Saeed al-Shehri, in the Arabian Peninsula, regarded by Washington as the jihadist network's deadliest branch, in a raid in the east, the defence ministry news website said on Monday. Duration: 00:37