Rescuers are using drones to help search for avalanche survivors in Italy

CANAZEI, Italy — Rescuers using drones resumed the search Tuesday for an estimated 13 hikers unaccounted-for following an avalanche in northern Italy that killed at least seven people and is being blamed in large part on rising temperatures that are melting glaciers.

After rain hampered the search Monday, sunny weather on Tuesday allowed helicopters to bring more rescue teams up to the site on the Marmolada glacier, east of Bolzano in the Dolomites mountain range.

A huge chunk of the glacier cleaved off Sunday, sparking an avalanche that sent torrents of ice, rock and debris down the mountainside onto unsuspecting hikers below. At least seven people were killed and an estimated 13 remain unaccounted-for, officials said.

The terrain is still so unstable that rescue crews were staying off to the side and using drones to try to find any survivors while helicopters searched overhead, some using equipment to detect cellular pings. Two rescuers remained on site overnight, and were joined by more rescuers Tuesday morning.

"We're continuing the work of drones to find survivors, working the areas that we couldn't monitor yesterday," Matteo Gasperini, of the Alpine Rescue service, told Sky TG24. "We'll try to complete the work of monitoring the entire site."

Premier Mario Draghi, who visited the rescue base in Canazei on Monday, acknowledged avalanches are unpredictable but that the tragedy "certainly depends on the deterioration of the climate situation."

Italy is in the midst of an early summer heatwave, coupled with the worst drought in northern Italy in 70 years. Experts say there was unusually little snowfall during the winter, exposing the glaciers of the Italian Alps more to the summer heat and melt.

"We are thus in the worst conditions for a detachment of this kind, when there's so much heat and so much water running at the base," said Renato Colucci from the Institute of Polar Sciences of the state-run Council for National Research, or CNR. "We aren't yet able to understand if it was a deep or superficial detachment, but the size of it seems very big, judging from the preliminary images and information received."

The CNR has estimated that the Marmolada glacier could disappear entirely in the next 25-30 years if current climatic trends continue, given that it lost 30% of its volume and 22% of its area from 2004-2015.

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