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Experts say a quarter of Derna city is destroyed. Residents say at least one dam failed, sending a torrent of water through the city where the river meets the coast and submerging entire neighborhoods.

Experts say the dams hadn't been maintained for years. Meteorologists say this storm was also particularly intense, and was in keeping with a pattern of more extreme weather caused by human-induced climate change.

As of Thursday, the Libyan Red Crescent said that 11,300 people have been killed, and a further 10,100 are reported missing.

However, local officials suggested that the death toll could be much higher than announced.