The United States and Egypt called for calm as Khalifa Haftar pressed on with his offensive on Tripoli.
Secretary of State Mike Pompeo addressed the crisis in Libya during a phone call with Egyptian Foreign Minister Sameh Shoukry, the State Department said.
The two discussed “the urgent need to achieve a political solution in Libya and prevent further escalation,” State Department spokeswoman Morgan Ortagus said. Haftar is pressing ahead with an offensive against the internationally backed government in Tripoli.
The fighting has left 510 dead and driven more than 75,000 people from their homes, according to World Health Organization figures.
Haftar on a visit last week to France rejected a cease-fire urged by President Emmanuel Macron.
In an interview with the Journal de Dimanche newspaper, Haftar said he would continue the operation until “private militias and extremist groups,” who he alleged were gaining influence under Prime Minister Fayez Al-Sarraj laid down their weapons.