Detention centre run by warlord Khalifa Haftar was built in an agricultural factory near Tarhuna, site of recently discovered mass graves, local officials say.
Ankara and Moscow considering creation of joint working group to reach immediate ceasefire in North African country, a joint statement says.
Turkey has dismissed French allegations as "groundless," insisting its vessels only observed the warship. It has accused the French ship of a "high-speed and dangerous manoeuvre."
"On one side, NATO sees Russia as a threat but on the other side, NATO ally France is working to increase Russia's presence there," Turkish Foreign Minister Mevlut Cavusoglu has said.
A day earlier, Russian and other foreign mercenaries entered a key oil field in southern Libya, forcing a halt in operations.
Egyptian President Abdel Fattah Sisi warned over the weekend that any attack on Sirte or the inland Jufra air base by Libya's government forces would result in Egyptian military intervention.
Libya is at war with itself, but how did we get to this point?
Six military-grade Grad rockets were fired at strategic Mitiga airport, leading to diversion of air traffic, according to officials, who blamed the attack on warlord Khalifa Haftar's illegal militia.
President Erdogan said the "putschist Haftar ran away" from Moscow after Monday's peace talks between him and the head of the Tripoli-based government.
Warplanes of Libya's eastern government forces strike DAESH in Derna, forcing retreatment of terror group from port city
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