American B-2 stealth bombers and armed drones have attacked two Islamic State military camps in Libya, killing "dozens" of jihadists near their former bastion of Sirte, an official said Thursday.
The strike late Wednesday came a month after the United States officially wrapped up military operations in and around Sirte, where it had conducted nearly 500 strikes to help the Libyan unity government expel jihadists from the coastal city.
The fighters "were seen immediately beforehand carrying weapons, wearing tactical vests, carrying mortars and standing in formation," the official said, speaking on condition of anonymity.
He added that no civilians were thought to have been killed and no women or children were present.
The camps were about 45 kilometers (30 miles) southwest of Sirte. Pentagon spokesman Peter Cook said those targeted included IS fighters who had previously fled Sirte. "They posed a security threat to Libya, the region and US national interests," Cook said in a statement, noting that the strikes appeared to have been "successful."
The Pentagon had launched Operation Odyssey Lightning to help local forces push IS from Sirte on August 1.
When operations concluded last month, following the city's "liberation," the Pentagon left open the possibility of conducting additional anti-IS attacks if Libya's Government of National Accord asked for help in doing so.
Wednesday's strike was conducted with the "co-operation" of the GNA, the defense official said, noting that the move had been authorized by outgoing President Barack Obama.
B-2 stealth bombers, which have a distinctive flying-wing design, conducted the strike with the help of armed drones.
The fall of Sirte - former leader Moamer Kadhafi's hometown located 450 kilometers east of Tripoli - was a major setback for IS, which has also faced military defeats in Syria and Iraq.
Libya descended into lawlessness after the Nato-backed ousting of long-time dictator Kadhafi in 2011, with rival administrations emerging and well-armed militias vying for control of its vast oil wealth. "These strikes will degrade ISIL's ability to stage attacks against Libyan forces and civilians working to stabilise Sirte, and demonstrate our resolve in countering the threat posed by ISIL to Libya, the United States and our allies," Cook said, using an alternate IS acronym.