Al-Libi was a key link between the Taliban and al-Qaida. He led and al-Qaida training camp and appeared in a number of Internet videos. The U.S. says he was likely behind the February 2007 bombing at the U.S. base at Bagram in Afghanistan during a visit by Vice President Dick Cheney. The attack killed 23 people.

Video: Top al-Qaida Commander Reportedly Killed

While the claim could not be verified independently, the announcement of his death appeared as a banner in a section of the Web site reserved for affiliated militant organizations, according to the Washington-based SITE Institute which monitors such sites.

"As the banner was posted ... by a webmaster of the forum, it seems as if the announcement of his death has been confirmed to the forum administrators," SITE said in an e-mail to news organizations.

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