Fierce clashes and heavy bombing were reported in the early hours of Saturday in the Libyan capital.
Tripoli International Airport has been exposed to violent armed clashes between Zantan revolutionaries, who control the airport, and Islamist-led Misrata militias, since July 13, leaving 200 killed.
The month-long battle is one of the worst spurts of violence the country has seen since the ouster and killing of Libya's ruler for 42 years Colonel Muammar Gaddafi in 2011.