Clashes between forces loyal to Libya's Tripoli-based Government of National Accord (GNA) and those loyal to Khalifa Haftar, who commands forces loyal to a rival government based in the country's east, continued Monday, according to local sources.
Al Jazeera's Mahmoud Abdelwahed said services at the Mitiga airport in eastern Tripoli were temporarily suspended after the attack on Monday.
"In the area around the airport, civilians were terrified immediately after this air strike".
The UN mission in Libya said on Twitter that Salame met Monday with unity government head Fayez al-Sarraj in Tripoli to discuss how to "assist at this critical and hard juncture".
"Refugees told UNHCR that they were frightened and anxious about their safety, given ongoing fighting in the vicinity, and that they were left with minimal supplies", the statement said, adding the agency was working to ensure other detained migrants and refugees were not in harm's way. Ironically, the violence over the next few days has forced the U.S.to evacuate its remaining forces-there for diplomatic security and counterterrorism-from the volatile country.
The government based in Tripoli now enjoys worldwide recognition and some Western support, while the government in the eastern Libyan city of Tobruk has benefited from the support of Egypt, the Saudis, and the United Arab Emirates.
In central Tripoli, while there were no signs yet of military and security vehicles or personnel on the streets, shops and cafes were closing earlier than usual in the evening and residents were apprehensive about the prospect of violence.
A Reuters correspondent in the city centre could hear gunfire in the distance southwards.
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It reported 11 deaths without saying on which side.
The United Nations said 2,800 people had been displaced by the clashes and many more could flee, though some were trapped.
Also Monday, U.N. envoy Ghassan Salame said he met with Fayez Sarraj, head of the government in Tripoli, to discuss how the U.N. mission "can assist at this critical and hard juncture".
The violence has thrown into doubt a United Nations plan for an April 14 to16 conference to plan elections as a way out of the anarchy since the Western-backed toppling of Gaddafi eight years ago.
The European Union joined the United Nations, United States and G7 bloc in calling for a ceasefire, a halt to Haftar's advance and return to political negotiations.
Its elite Saiqa (Lightning) force, numbers some 3,500, while Mr Haftar's sons also have well-equipped troops, LNA sources say.
Since NATO-backed rebels ousted Gaddafi, Libya has been a transit point for hundreds of thousands of migrants trekking across the Sahara in hope of reaching Europe across the sea.
Forces backing the Tripoli-based GNA on Sunday announced a counteroffensive dubbed "Volcano of Anger".