"They targeted the civil airport in Ras Lanuf, and oil tanks in Es Sidra. The rockets fell near the tanks, resulting in only minor damage," said Ali Hassi, a spokesman for forces protecting oil infrastructure.
A spokesman for the Tripoli-allied forces did not immediately respond to a request to confirm the attack.
Oilfields and ports are increasingly a target in Libya's conflict, which pits two rival governments and their armed forces against each other, nearly four years after the civil war that ousted Muammar Gaddafi.