Thousands of people are feared dead after a powerful storm triggered devastating flooding in Libya.

The leader of the east Libyan government, which is not recognised internationally, said deaths exceeded 2,000 and thousands were missing.

Jalel Harchaoui, a Libya specialist, told the BBC the death toll could reach as many as "several thousand" people.

Storm Daniel made landfall on Sunday, prompting authorities to declare a state of extreme emergency.

Seven Libyan army personnel went missing during ongoing rescue efforts.

The head of the Red Crescent humanitarian network said at least 150 deaths had occurred in Derna alone, according to news agency Reuters.

Two dams in Derna - home to approximately 100,000 people - reportedly collapsed, submerging much of the area and drowning some residents.

Authorities consequently declared the port a "disaster city".

Eastern Prime Minister Osama Hamad told a Libyan television channel: "The missing are in the thousands, and the dead exceed 2,000... entire neighbourhoods in Derna have disappeared, along with their residents ... swept away by water."

Mr Hamad did not give a source for his figures.

Alongside areas in the east, the western city of Misrata was among those hit by the floods.

Unverified videos of the storm have been circulating online, including a clip showing torrents of floodwater sweeping a man away. Other footage shows drivers trapped on their car roofs.

Alongside schools and shops, four major oil ports closed because of the storm.

While the Benghazi-based administration has been dealing with matters in the east of the country, the rival, internationally recognised government in the capital, Tripoli, has also been involved.

Its Prime Minister, Abdulhamid Dbeiba, said on Sunday that he had directed all state agencies to "immediately deal" with the damage and floods, while the United Nations in Libya said it was following the storm closely and would "provide urgent relief assistance in support of response efforts at local and national levels".

Libya has been divided between two rival administrations since 2014, following the killing of long-time leader Muammar Gaddafi in 2011.

Both governments declared three days of mourning after Storm Daniel swept in.

Last week, it struck Greece, Turkey and Bulgaria, killing more than a dozen people.

Egypt was on Monday bracing itself for Storm Daniel and in the evening, the nation's meteorological organisation said rainclouds had multiplied over the northwestern coast.

Climate scientists have warned that global warming means more water evaporating during the summer, leading to more intense storms. (BBC)

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