As many as 3,000 people are estimated dead and many more are missing after Storm Daniel lashed eastern Libya, particularly the city of Derna.
The United Nations says emergency teams are being mobilised to help on the ground in the politically divided country.
Red Cross official Tamer Ramadan says about 10,000 people are missing after the floods. He warns the death toll is “huge” and expected to rise by thousands in the coming days.
After more than a decade of turmoil, Libya remains divided between two rival administrations: one in the west and the other in the east, each backed by different militias and foreign governments.