of NTC combatants in dozens of pickups fired rockets from the west of the Mediterranean city whose seizure will enable the NTC to declare the liberation of Libya and clear the way for an election timetable.

An AFP correspondent said Sirte's main square and entire waterfront were under NTC control, along with its fortress-like conference centre, university campus and main hospital, all of which the fighters seized on Sunday.

"All our lines are now in place; the area is completely surrounded," said NTC commander Zubayr Bakush.

Farther east, a group of fighters threw petrol on a billboard of Kadhafi as others cheered and fired into the air with cries of "Allahu akbar" (God is greatest) blasting from a van loudspeaker.

"There are snipers in the buildings up there," fighter Basit Divas told AFP, pointing to a neighbourhood of pock-marked villas, before hundreds of NTC troops advanced backed by a barrage of heavy weapons fire.

Within a few hours, the new regime forces had advanced another two kilometres (1.2 miles) and were meeting only small pockets of resistance, with most of the firing in one direction -- at the Kadhafi loyalists.

There was some incoming sniper fire as they blasted buildings with RPGs, machineguns and anti-aircraft guns.

NTC soldiers went house to house, clearing each, and sometimes taking prisoners.

In the kitchen of one large villa, half-finished cups of tea sat on a tray. Outside another, a man was on his knees in the courtyard, his hands tied behind his back, pleading with his captors.

"This man had a gun, and two AK-47s. We think he may be from Kadhafi's operation room," said Ayub Basina, who identified himself as an NTC doctor.

In one house, NTC forces found 15 Kalashnikovs, seven RPGs and a field radio.

A dozen black prisoners, their hands tied behind their backs, being seen being taken from one house and put aboard a pick-up.

An AFP correspondent reported a fierce firefight around a school where Kadhafi loyalists were putting up strong resistance. He saw at least six bodies and said dozens of fighters had been wounded.

NTC forces then withdrew to bombard the building with mortar fire.

The plight of stranded civilians raised the concerns of Human Rights Watch, which called on both sides to minimise harm to them and ensure that prisoners are treated humanely.

"Commanders on the ground in Sirte need to make sure that their forces protect civilians and allow them to flee the combat zone," said Fred Abrahams, special adviser at HRW.

"All prisoners should be treated humanely and transferred to the NTC authorities who can better ensure their safety," he said in a statement.

The New York-based watchdog said much of Sirte's population of around 100,000 has already fled, but that an unknown number remain. Continued...