According to the Telegraph newspaper, the U.S military launched the first of what is expected to be a sustained series of air strikes in Libya targeting ISIL of Iraq and the Levant’s stronghold of Sirte.
Strikes were authorized by President Barack Obama after being requested by the United Nations-backed government in Libya.
The last US bombing in Libya was in February and the intervention marked its first to support Libyan forces in their battle against ISIL in Sirte.
It was likely to mark the start of a more intense US involvement in Libya, opening a new and more persistent front against ISIL.
The strikes involved aircraft and unmanned drones and targeted vehciles including a tank location.
ISIL seized Sirte last year, making it their most important base outside Syria and Iraq, but they are now besieged in a few square miles in the center.
They hold several strategically important sites including the university, the main hospital and the Ouagadougou conference hall, where they are believed to have stockpiled large amounts of ammunition.
A Pentagon spokesman said the ISIL vehicles were targeted with “precision strikes” and there would be more to come. He said no ground troops would be deployed.
The spokesman said: “Additional US strikes will continue to target ISIL in Sirte to enable the Government of National Accord to make a decisive, strategic advance.”
Fayez Seraj, the prime minister, speaking on Libyan television, said: “The first air strikes were carried out at specific locations in Sirte today causing severe losses to enemy ranks.”