US probes if Gaddafi ordered Saudi leader's killing

President Bush, who has presided over improving ties with Libya, vowed to discover the truth about the accusations and warned Gaddafi he would make him honor his commitment last year to renounce terrorism.

Washington raised its concerns directly with Gaddafi after an American Muslim in custody in the United States alleged last year that the leader instructed Libyan intelligence agents to kill Crown Prince Abdullah, US officials said.

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Libya denied the accusation.

"What I can tell you is that we are going to make sure we fully understand the veracity of the plot line. So, we are looking into it," Bush told reporters in Sea Island, Georgia, where he attended a Group of Eight summit. "When we find out the facts, we will deal with them accordingly."

The US investigation began as the United States and Britain were welcoming back into the international community their longtime adversary Gaddafi after he decided to dismantle his illegal weapons of mass destruction.

"I have sent a message to him that if he honors his commitments to resist terror and to fully disclose and disarm his weapons programs we will begin a process of normalization, which we have done. ... And now we will make sure he honors his commitment," Bush said.

State Department spokesman Richard Boucher said Libya "assured us that they would not support the use of violence for settling political differences with any state."