27/08/2011 14:49 BST | Updated 27/10/2011 06:12 BST

Atiyah Abd al-Rahman, Al-Qaida's No. 2, Killed In Pakistan According To United States Administration

PRESS ASSOCIATION -- Al Qaida's second in command, Atiyah Abd al-Rahman, has been killed in Pakistan, delivering another big blow to a terrorist group that the US believes to be on the verge of defeat, a senior Obama administration official said today.

The Libyan national who was the network's former operational leader rose to al Qaida's number two spot after the US killed al Qaida leader Osama bin Laden during a raid on his Pakistan compound in May.

Defence Secretary Leon Panetta said last month that al Qaida's defeat was within reach if the US could mount a string of successful attacks on the group's weakened leadership.

"Now is the moment, following what happened with bin Laden, to put maximum pressure on them," Panetta said, "because I do believe that if we continue this effort we can really cripple al Qaida as a major threat."

Al Rahman was killed on August 22 in the lawless Pakistani tribal region of Waziristan, according to the official, who insisted on anonymity to discuss intelligence issues.

The official would not say how al Rahman was killed. But his death came on the same day that a CIA drone strike was reported in Waziristan. Such strikes by unmanned aircraft are Washington's weapon of choice for killing terrorists in the mountainous, hard-to-reach area along the Pakistan-Afghanistan border.

Al Rahman, believed to be in his mid-30s, was a close confidant of bin Laden and once served as bin Laden's emissary to Iran.

Al Rahman was allowed to move freely in and out of Iran as part of that arrangement and had been operating out of Waziristan for some time, officials have said.

Born in Libya, al Rahman joined bin Laden as a teenager in Afghanistan to fight the Soviet Union.

After Navy Seals killed bin Laden, they found evidence of al Rahman's role as operational chief, US officials have said.