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TRIPOLI, Libya - Libya's new rulers believe Moammar Gadhafi may be hiding in the southern desert, possibly in a vast area near the Algerian border, under the protection of ethnic Tuareg fighters, an official said Wednesday.

Abdel-Rahman Busin, a military spokesman in Tripoli, also said revolutionary forces knew Gadhafi's son, Seif al-Islam, was in the regime stronghold of Bani Walid two weeks ago because they held negotiations about his possible surrender. But he said the talks had broken down and it was not known whether he was still in the town.

Revolutionary forces gained control of Tripoli and much of the rest of the North African nation late last month, but Gadhafi fled and has been trying to rally supporters from hiding as fighting continues on three fronts. His sons also escaped and there have been several unconfirmed reports about their whereabouts.

Military officials fear Gadhafi may still be able to stoke violence from his hiding place.

Busin said the military has intelligence that Gadhafi is hiding in the vast southern desert with help from Tuareg fighters. Ethnic Tuaregs, whose nomadic community spans the desert border of Niger, Mali, Libya, Algeria and Chad, are among Gadhafi's strongest remaining supporters.

"We do believe that he is somewhere in that region and we do know that Tuaregs are supporting him, probably because he's paying them," Busin said.

He did not offer evidence and acknowledged the military cannot confirm anything.

"It's a very large bit of land to cover. We don't have the people to cover it all and he could move around quite freely," Busin told The Associated Press.

One report suggested Gadhafi was southwest of the desert town of Sabha, Busin said. He also said a recent attack on the border town of Ghadamis raised suspicion that the fugitive leader was hiding in the surrounding region, a vast area near the Algerian frontier. "Possibly they were just creating a diversion," he said.

Pro-Gadhafi gunmen crossed the border from Algeria to attack revolutionary forces in Ghadamis last week, killing at least nine people, local officials said.

Ali al-Mana, the Ghadamis representative on the National Transitional Council, said there was no confirmation that Gadhafi was in the city.

Many Libyans believe Gadhafi's son Seif al-Islam and other regime members are holed up in Bani Walid, 90 miles (140 kilometres) southeast of Tripoli, where revolutionary fighters have been stalemated with loyalist fighters for weeks.

Busin said anti-Gadhafi forces had confirmation Seif al-Islam was in Bani Walid a couple weeks ago but talks about his possible surrender had broken down and his location was no longer known.

On Tuesday, Syrian-based Al-Rai TV, which has become the former regime's mouthpiece, aired video of Seif al-Islam that it said was taken last week. The same video, however, appears to have been uploaded to YouTube on March 6. A second YouTube video appears to show the same event with an upload date of Feb. 27, less than two weeks after the Libyan uprising began.

Seif al-Islam's last known public appearance was on Aug. 23 in Tripoli. Like his father, he has been charged by the International Criminal Court with crimes against humanity for the regime's bloody efforts to crush the uprising.

Revolutionary fighters also have been unable to rout regime forces from Gadhafi's hometown of Sirte on the Mediterranean coast. Libyan fighters pounded regime positions in the city with rocket and artillery fire on Wednesday, sending a black cloud of smoke over Sirte's low-slung skyline.

Dozens of trucks mounted with missiles, anti-aircraft guns and anti-tank weapons streamed toward the front lines on the western edge of Sirte and NATO warplanes roared overhead.

Britain's Ministry of Defence said Royal Air Force and NATO aircraft "were very active" over Sirte on Tuesday. The alliance usually only gives details about strikes the next day.

Maj. Gen. Nick Pope said Tornado GR4s twice conducted precision strikes on a large ammunition and vehicle storage depot that has been serving as one of the main bases for Gadhafi's garrison within the city.

He said six laser and GPS guided Paveway bombs were dropped, scoring direct hits that destroyed multiple military facilities within the depot, including storage bunkers.