Libya : Libyan government fighters have captured Muammar Gaddafi’s son Mo’tassim as he tried to escape the battle-torn city of Sirte, National Transitional Council (NTC) officials said.

The capture of the deposed leader’s national security adviser, and the first member of the Gaddafi family, is a boost to Libya’s new rulers, whose forces are still battling pro-Gaddafi fighters in his home town of Sirte.

“He was arrested today in Sirte,” Colonel Abdullah Naker told Reuters on Wednesday. Other NTC sources said Mo’tassim was taken to Benghazi where he was questioned at the Boatneh military camp where he is being held. He was uninjured but exhausted, the officials said.

Hundreds of NTC fighters took to the streets in several Libyan cities and fired shots in the air in celebration.

Gaddafi loyalists have fought tenaciously for weeks in Sirte, one of just two major towns where they still have footholds, two months after rebels seized the capital Tripoli.

“We have control of the whole of the city except neighbourhood ‘Number Two’ where the Gaddafi forces are surrounded,” said Khaled Alteir, a field commander in Sirte.

Green flags, the symbol of Gaddafi’s 42 years in power, still fly above many of the buildings there.

NTC tanks moved close up to buildings used by snipers and blasted large holes in the walls. Behind them came pick-up trucks mounted with heavy machine guns, and behind them, the infantry armed with AK-47s began the assault.

The remaining forces still loyal to Gaddafi have been firing back on the attackers with small arms and rocket-propelled grenades, but they were no longer using heavier weapons and their forces had lost some cohesion, an NTC commander said.

“We’ve noticed now they are fighting every man for himself,” said Baloun Al Sharie, a field commander. “We tried to tell them it’s enough and to give themselves up, but they would not.”

The assault by the new government forces is still being aided by NATO reconnaissance and strike aircraft. Britain said its jets had bombed and destroyed two pick-up trucks belonging to Gaddafi’s forces in Sirte on Wednesday.