Ali al-Essawi, who resigned as Libyan ambassador to India on Tuesday, told Al Jazeera that fighter jets were used by the government to bomb civilians.
He said live fire was being used against protesters, and that foreigners had been hired to fight on behalf of the government.
Al-Essawi labelled the violence "a massacre", and called on the UN to block Libyan airspace in order to "protect the people".
Al Jazeera's Prerna Suri interviewed him about the crackdown.
Source: Al Jazeera