The two rival governments in Libya are co-ordinating relief efforts for flood victims, the UN has said.
More than 5,300 people died after two dam bursts brought devastating floods to the eastern city of Derna.
At least 10,000 people are missing, and tens of thousands more have been displaced.
A UN official said that both the eastern and western governments had requested international aid and were liaising with each other.
In pictures: Desperate search for flood survivors
"Both governments have reached out to the international community requesting services and help," Tauhid Pasha, of the International Organisation for Migration, told BBC Radio 4's the World Tonight programme.
"The Government of National Unity [western government] has extended its support to us and its request on behalf of the entire country and they are also co-ordinating with the government in the east," he said.
"The challenge now is the international community responding accordingly to the needs and the requests of the governments," he added.
Mr Pasha said support needed to be scaled up "very, very quickly and to do so we need money".
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