Noman Benotman, a former Libyan jihadist with links to al-Qaida who is now an analyst at London's Quilliam Foundation, said other groups inspired by the terror network have been gaining a following since Gadhafi's fall. There have been nearly a dozen attacks against Western targets in Libya recently, he said.
"It's the same al-Qaida ideology that is driving these militants," Benotman said.
He added, however, that the militants were unlikely to target oil or gas installations in Libya because they need support from the population. "Targeting these installations would turn Libyan workers and tribes against them," he said.
Oil companies working in other parts of Libya said they were aware of government warnings to citizens but there were no immediate plans for evacuations.