The Libyan National Army on Monday mounted air strikes on positions in the central city of Sirte held by the Government of National Accord, an official and residents said.
Khalifa Haftar's LNA has been trying since April to take Tripoli from militias loyal to the GNA headed by Fayez al-Sarraj.
There had been LNA-claimed strikes in recent days on the outskirts of Sirte, some 450km east of Tripoli, but not the city center itself, residents told Reuters.
A strike hit a building near a feedstock plant, but an LNA official said the force had targeted a military position.
Mitiga airport, the only working airport in Tripoli, was also targeted in the early hours of Monday, an LNA source told Reuters.
It has been closed due to continued air strikes.
