Reports suggest that the victims could have been killed by fighter jets and helicopter gun-ships.
"It's not entirely clear how these men were killed, it could have been by fighter jets, it could have been by helicopter gunships, it could have been by mortar, it could have been by heavy machine guns," AFP quoted Martin Fletcher, an editor with The Times newspaper as saying on Wednesday.
The newspaper says it has obtained shocking footage of corpses with bodies blasted off and severed torsos in the Libyan hospital.
"One thing is abundantly clear, they were not killed by tear gas or by batons or by methods of suppressing peaceful protests that are generally considered the outer limits of what is acceptable," Fletcher added.
Libyan ruler Muammar Gaddafi, who swept to power 42 years ago in a bloodless military coup, delivered a televised address on Tuesday in which he vowed to fight on to his "last drop of blood" and urged his supporters to take to the streets to confront the pro-democracy protesters.
Meanwhile, Libyan Interior Minister Abdel Fatah Yunes has announced his plan to resign and called on the military to join forces with the people against Gaddafi.
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