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bbc.co.uk / 26 August 2011 Last updated at 17:28 GMT.
Residents said some people had been alive when they arrived at the hospital.
More than 200 decomposing bodies have been found abandoned at a hospital in a district of the Libyan capital, Tripoli, that has seen fierce fighting.
A BBC correspondent found corpses of men, women and children on beds and in the corridors of Abu Salim's hospital.
Doctors and nurses fled after clashes erupted nearby between rebel forces and those loyal to Col Muammar Gaddafi.
Some residents accused the regime of murdering those at the hospital, but it is not yet clear how exactly they died.
Meanwhile, rebel forces faced stiff resistance as they advanced on Sirte, Col Gaddafi's birthplace and the town regarded as his last stronghold.
Rebel commanders said they were consolidating their frontline at the oil port town of Ras Lanuf, after withdrawing from positions nearer Sirte to put themselves out of range of rockets fired by pro-Gaddafi forces.
The UK said its planes carried out an overnight missile attack on a large command-and-control bunker in Sirte.
There were also reports of intense fighting in and around Tripoli's international airport, although the centre of the city is mainly quiet.
The BBC's Wyre Davies in Tripoli says the scene at the hospital in Abu Salim was one of the most appalling and distressing he had ever seen.