CAIRO, Egypt —  An Al Qaeda commander who escaped from a U.S. prison has posted a Web video urging Muslims to kill the Saudi king for leading an interfaith conference in Madrid earlier this month.

Abu Yahia al-Libi, who escaped from Afghanistan's Bagram prison in 2005, says "bringing religions together...means renouncing Islam."

Saudi King Abdullah sponsored the dialogue among Jews, Muslims, Christians, Hindus and Buddhists, and encouraged all faiths to turn away from extremism.

But al-Libi says "equating Islam with other religions is a betrayal of Islam." He calls for "the speedy killing of this tyrant."

The 43-minute video was posted late Monday on an Internet site frequently used by militants. Its authenticity could not be independently verified.

Al Qaeda leader Osama bin Laden has also frequently lashed out at the royal family of his native Saudi Arabia, a U.S. ally.