Al Qaeda No. 2 Dr. Ayman al-Zawahri said on Saturday that a Libyan group had joined Osama bin Laden's network and he urged mujahideen in North Africa to topple the leaders of Libya, Tunisia, Algeria and Morocco.

"O nation of jihad support your sons so that we defeat our enemies and rid our homeland of their slaves," said Zawahri, in a recording posted on Saturday. According to Reuters, the audio tape produced by al Qaeda's media arm was posted on an Islamist Web site.