Al Qaida leader features in new video amid rumours he has died

File photo of Ayman al-Zawahri, centre left, and Osama bin Laden, centre, hold a news conference in Afghanistan (AP)

Al Qaida leader Ayman al-Zawahri appeared in a new video marking the 20th anniversary of the September 11 attacks, months after rumours spread that he was dead.

The Site Intelligence Group that monitors jihadist websites said the video was released on Saturday.