Libyan forces battling to oust Islamic State from Sirte said they had made major advances on Wednesday, capturing a convention center previously used as a base by the jihadist group, as well as the city's university and hospital.
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"Our forces have complete control of the whole of the Ouagadougou (convention) complex - they even advanced some distance beyond the complex," said Rida Issa, a spokesman in the forces' media office.
If the gains are confirmed, it would mark the biggest advance the forces have made for weeks. They come 10 days after the United States began air strikes over Sirte, which fighters say have eased their advance on militants encircled in the center of the city.
The capture of the Ouagadougou complex would also be an important symbolic victory. The large domed building is a landmark in Sirte, the hometown of late dictator Muammar Gaddafi, and was used for meetings and religious instruction by Islamic State after they took control of the city last year.
Forces aligned with Libya's U.N.-backed government launched their campaign for Sirte in May. Their advance slowed as they approached the center of Sirte, and the forces, led by brigades from the city of Misrata, have suffered heavy casualties from IS landmines and snipers.
Clashes have been sporadic, with heavier fighting interspersed with lulls that last for several days.
Since Aug. 1, U.S. drones and fighter jets have carried out a total of 29 strikes, targeting several IS emplacements on Monday and a gun-mounted pick-up truck on Tuesday, according to statements by U.S. Africa Command.
In Wednesday's clashes, the government-backed forces said they had also advanced to a cluster of unfinished blocks just west of the center of Sirte known as the "bone buildings, which had been used by Islamic State snipers.
At least three fighters from the government-backed forces were killed and 11 wounded, Issa said, adding that he expected the toll to rise.
Earlier in the day, Libyan forces said they had lost a fighter jet over Sirte. Issa said the cause of the crash and the fate of the crew could not be confirmed, but Islamic State claimed it had shot down the jet, killing a pilot, according to a statement on a website close to the group.
Libyan militants returning from combat in Syria's civil war helped implant Islamic State in Libya in 2014, but IS has struggled to win support or hold territory as most local people regard it as a malign import dependent on foreign fighters.