NYT:
In recent years, Al Qaeda has formed a special media production division called Al Sahab to produce videos about leaders like Mr. bin Laden and Mr. Zawahri, terrorism experts say. The group largely once relied on Arab television channels like Al Jazeera to broadcast its videos and taped messages.
Al Sahab, whose name means the cloud, has continued to draw on a video library featuring everything from taped suicide messages by the Sept. 11 hijackers to images of gun battles and bombings spearheaded by Al Qaeda and others, said Marwan Shehadeh, an expert on Islamist movements with the Vision Research Institute in Amman who has close ties to jihadists in Jordan and Syria.
Here.