Libya's air force also participated in the air strikes on Libya, which targeted Derna, an eastern coastal city regarded as a base for fighters of the so-called Islamic State.
"There are losses among individuals, ammunition and the (Islamic State) communication centres," Libyan air force commander Saqer al-Joroushi told Egyptian state television, adding that dozens had been killed.
Joroushi, who is loyal to Libya's internationally recognised government, which set up camp in the city of Tobruk after losing control of the capital Tripoli, said there would be more strikes on Tuesday.
More top news
With just 101 days to go until Brexit, preparations for crashing out of the EU bloc are being stepped up.
Spurs fan Averof Panteli admitted hurling the item at Arsenal’s Gabon striker Pierre-Emerick Aubameyang.
Fresh Prince Of Bel-Air star Alfonso Ribeiro is suing the creator of Fortnite for allegedly using the "Carlton dance" in the video game.