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At least 10 people have been killed in southern Italy after they were hurled over rocks by a raging white-water creek in a deep mountain gorge that swelled suddenly after heavy rainfall upstream.
The civil protection department said 18 people were rescued and six of those were injured in the flash rush of water in the Calabria region on Monday.
It was not clear how many people were missing because not all had entered the gorge with official guides and registered. Spotlights were brought to the area so the search could continue during the night.
The nationalities of the dead and injured were not immediately known. Most tourists and trekkers who visit the area, in the country's deep south, are Italian.
In some places the Raganello creek, part of the Pollino National Park, is at the bottom of a narrow, one-kilometre(0.8-mile)-deep gorge in the mountain. Rescue teams used ropes to descend the sides of the mountain to reach the site.
"This gorge filled up with water in a really short space of time and these people were catapulted out like bullets. They ended up some three kilometres (two miles) down the valley," said Carlo Tansi, head of the civil protection department in Calabria.
"It is really difficult terrain, filled with obstacles because of the (geological) formation of the area," said Eugenio Facciolla, the chief prosecutor of the provincial capital, Cosenza.
He said rescuers working under spotlights were trying to locate areas where some people may have survived by ending up on small patches of shore or tiny islands in the creek.
Helmeted mountain rescue squads rushed from the nearest town of Civita to reach the gorge, a popular tourist attraction in summer.
The most seriously injured were taken by helicopter to hospitals in Cosenza.
Last week, a motorway bridge collapsed in the northern Italian port city of Genoa, killing 43 people.