"Armed conflict and political instability has impacted over 3 million people across Libya," the Office for the Coordination of Humanitarian Affairs (OCHA) said in a report published on Thursday.
In a country of 6.3 million, "2.44 million people are in need of protection and some form of humanitarian assistance", it said.
The needy include people forced to flee their homes and those living in conflict-hit areas, as well as refugees, asylum-seekers and migrants, OCHA said.
There have been clashes in major cities such as Tripoli, Misrata, Sirte, Benghazi and Derna along the coast and in the central oasis city of Sabha, OCHA said.
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Since last summer, some 435,000 people have been forced to
flee their homes, of whom 100,000 now live in outdoor camps or abandoned buildings such as schools and warehouses, the report said.
"The displaced are particularly vulnerable due to limited coping capacities and loss of assets, particularly displaced women, children, the elderly and those who are impoverished," it said.