Libyan National Army said it targeted a hangar "which houses Turkish drones and their ammunition".
The GNA blamed Haftar's forces for the attack against the airport, and for a separate alleged attack in the Soug al-Jomaa district of Tripoli.
Forces battling for control of Libya's capital agreed to a truce Saturday, on the eve of the Muslim festival of Eid Al-Adha
GNA said it "accepted a humanitarian truce for Eid al-Adha," which will be celebrated in Libya on Sunday, Monday and Tuesday.
Pro-GNA forces have weathered the initial onslaught and since then fighting has remained
Six fighters loyal to the Tripoli-based Government of National Accord (GNA) were killed and several others wounded.