According to BBC reports a doctor in the city of Benghazi confirmed that at least 45 bodies and 900 wounded had been brought to just one hospital on Saturday, describing the scene as a “massacre”.
Benghazi has been a leading focus of protests against Col Gaddafi’s rule.
Libya is one of several Arab countries to have experienced pro-democracy rallies since the fall of long-time Tunisian President Zine El Abidine Ben Ali in January. Egypt’s Hosni Mubarak was forced from power on 11 February.
Col Muammar Gaddafi is the Arab world’s longest-serving leader, having ruled the oil-rich state since a coup in 1969.
Reports are difficult to verify as the Libyan authorities have imposed severe media restrictions.
The Benghazi doctor told the BBC that at least 45 bodies and 900 injured people had been brought to Jala hospital – most of them with gunshot wounds.
“Ninety percent of these gunshot wounds were mainly in the head, the neck, the chest, mainly in the heart,” she said.
She added that she has been in contact with other Benghazi hospitals, which she says were overwhelmed by casualties and have not been able to count the dead.