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Shukri Ghanem, head of the state-run National Oil Corporation Image Credit: AP

Tunis: Libya's oil minister has defected and fled to Tunisia, a Tunisian security official said Tuesday, one of the highest profile figures to abandon Muammar Gaddafi's government.

Shukri Ganem, the head of the national oil company and Libya's oil minister, crossed into Tunisia by road on Monday and defected, the Tunisian official said. The official, based in the region around the Ras Jdir border crossing, was not authorised to speak to the media.

Ganem is one of the most prominent members of Gaddafi's government to defect amid fighting between the military and rebels. A Nato-led campaign of airstrikes is seeking to protect civilians from attacks by Gaddafi's military.

Ganem is among Gaddafi officials under U.S. sanctions announced by the Treasury Department in early April.

Libyan government spokesman Moussa Ibrahim denied Monday night that Ganem had defected. "He is working in his office," he told The Associated Press.

Abdul Monaim Al Houni, a former Libyan Arab League representative who was among the first wave of Libyan diplomats to defect, confirmed the defection but said no official announcement has been made out of concern for the safety of some of his family members who are still in Tripoli.

Al Houni said that he spoke to Ganem after he crossed the border.

"Most of the officials remaining in Tripoli are forced to stay under intimidation and pressure. They are not happy with what is happening," Al Houni told the AP.

Guma Al Gamaty, London-based spokesman for Libya's Interim National Council, said "all what we know is that Shukri Ganem is in Tunisia".