Farjani said he witnessed the gruesome site where the Abu Salim victims were found.
"We were invited to visit the place where the corpses of the prisoners at Abu Salim were found, where we saw scattered human bones," he said.
Farjani also referred to "egregious acts committed against dead bodies, on which acid was poured to eliminate any evidence of this massacre."
Sharif said the task of identifying the remains would "require some time."
International rights groups had for years urged Gaddafi's regime to come clean about the fate of prisoners killed at the jail during a 1996 riot.
On the warfront, NTC fighters flashed V-for-victory signs as they moved into Sirte on pickup trucks and larger lorries, backed by three artillery tanks as they shouted "Allahu Akbar" (God is greatest).
As they rolled in from Sirte's eastern gate, two ambulances sped out with sirens ablaze, and other NTC fighters emerged from the Gaddafi bastion, where they said there were firefights.
"We are fighting with Kalashnikovs and small arms around the city centre," Mar'ee Saleh of the Ali Hassan Jabar Brigade told AFP.
"We are firing at Kadhafi's men but their return fire is not very strong," he said as he exited from the eastern gate, adding he saw NATO warplanes carry out strikes during the day.
Many of the pickup trucks entering the city carried food and water supplies, as well as mattresses, an indication the fighters were planning to take stranglehold positions inside Sirte, the correspondent said.
"There are clashes inside the city. Two small girls were killed today when a Grad rocket fired by Kadhafi forces hit a home in Sirte," said Makhluf al-Farjani, spokesman of Sirte's military council.
On Sirte's western outskirts, NTC forces held their ground saying they had received instructions not to launch a fresh assault into Sirte to allow NATO to carry out operations.
NATO aircraft launched at least a dozen air strikes around Sirte on Sunday morning, an AFP correspondent said.
On Saturday, the alliance blew up 29 armed vehicles, a firing position, two command and control nodes and three ammunition storage facilities in the area, the alliance said in an operational update.
One Sirte resident who managed to flee early on Sunday said fighting subsided at around 7:00 pm on Saturday.
"There are African mercenaries roaming across the city. They are firing at houses with anti-aircraft guns in district one" on the western edge of Sirte, he said, refusing to give his name for security reasons.
He also said he twice saw one of Gadaffi's sons, Mutassim - once in a command centre in a hospital basement, over the past three weeks.
Frontline fighters in Sirte have repeatedly said Mutassim is holed up in its southern outskirts.
The weekend assault on Sirte came after reports of a rapidly deteriorating humanitarian situation in the city of around 75,000.
NATO forces struck at Gaddafi forces after reports emerged from Sirte of "executions, hostage-taking, and the calculated targeting of individuals, families, and communities within the city," the coalition said Saturday.
The assault on Ghadames, 600 kilometres southwest of Tripoli, came at dawn, killing at least eight NTC fighters and wounding 50, said Muhandes Sirajeddin, deputy chief of the local council.
"The attack began at around 5:30 am (1530 NZT). Around 100 Gaddafi loyalists, including mercenaries who came from around Algeria (across the border), and groups of Tuareg took part in the fighting," he said.
Sirajeddin and two other residents said clashes were still under way in Ghadames, a UNESCO World Heritage Site and home to Roman ruins.
Heavy fighting also raged in Bani Walid, the only other remaining pro-Gaddafi bastion, with NTC fighters coming under fire from inside the town, an AFP correspondent said.
NTC commander Omar Mukhtar said his men are "regrouping" but would not attack on Sunday.
"We are getting ready," he said, as an AFP correspondent saw five tanks rolling up to the front line.
NTC forces believe that Kahdafi's most prominent son, Seif al-Islam, is holed up in Bani Walid. "We know exactly where he is," Mukhtar said.