The devastating storm that dumped torrential rains along the Libyan coast this month was up to 50 times more likely to occur and 50% more intense because of human-caused climate change, according to an analysis released Tuesday.

Before crossing the Mediterranean, the storm raged for four days and caused extensive damage in central Greece and parts of Bulgaria and Turkey, a region where such extreme storms are up to 10 times more likely and up to 40% more intense because of climate change, scientists said.

Heavy one-day rains from Mediterranean storm Daniel caused massive flooding across eastern Libya that overwhelmed two dams, sending a wall of water through the coastal city of Derna that destroyed entire neighborhoods and swept bridges, cars and people out to sea. The death toll has varied, with government officials and aid agencies giving tallies ranging from about 4,000 to 11,000 dead.