Libyan forces have reportedly opened fire at a funeral in the eastern city of Benghazi, killing at least 15 people and injuring scores more as protests against Muammar Gaddafi, the country's long-time ruler, continued.

The victims on Saturday were mourning the loss of protesters who had been killed during anti-government demonstrations in the city during the past week, witnesses told Al Jazeera.

Reports of the deaths came after Human Rights Watch said earlier on Saturday that 84 people had died over the past three days.

Ahmed, a businessman and resident of Benghazi who declined to give his real name for his own safety, told Al Jazeera that hospitals in the city were overwhelmed with the number of dead and injured and were running out of blood.