Libyan military aircraft fired live ammunition at crowds of anti-government protesters in Tripoli, Al Jazeera television reported on Monday, quoting witnesses for its information.
"What we are witnessing today is unimaginable. Warplanes and helicopters are indiscriminately bombing one area after another. There are many, many dead," Adel Mohamed Saleh said.
Saleh, who called himself a political activist, said the bombings had initially targeted a funeral procession.
"Our people are dying. It is the policy of scorched earth." he said. "Every 20 minutes they are bombing."
Asked if the attacks were still happening he said: "It is continuing, it is continuing. Anyone who moves, even if they are in their car they will hit you."
No independent verification of the report was immediately available.
The protesters were reportedly heading to the army base to obtain ammunition of their own, but witnesses said the air force bombed the demonstrators before they could get there.
Clashes between protesters and security forces escalated on Monday and have spread to Tripoli, after Muammar Gadhafi's son went on state television to proclaim that his father remained in charge with the army's backing and would fight until "the last man, the last woman, the last bullet."