Residents of the Libyan capital of Tripoli say that unidentified warplanes were seen overhead on Monday, and several explosions heard, reports Reuters.
A Libyan TV channel claimed the planes were targeting areas that militias have sought to control, however none of the militias are believed to own warplanes Reuters said.
Since the ousting of Muammar Gaddafi in 2011, Libya has struggled to contain its armed militias. The past month has seen fighting escalate in Tripoli, particularly near the airport, and in Benghazi, where U.N. and foreign diplomats have been driven out.
On Sunday, the U.N. mission in Libya said in a statement that it condemned the "grave escalation" of fighting in Tripoli.