Italian rescue services continued their search on Tuesday morning in hopes of finding survivors of the glacial disaster that occurred in the Italian Dolomites on Sunday, the French news agency AFP reported.

Several mountaineers were overwhelmed by the avalanche that followed when part of the glacier suddenly broke off.

The disaster in the mountain village of Canazei left at least seven dead and eight injured. About fifteen people are still missing, but there is uncertainty about the total number of people who were on the mountain. At the foot of the mountain range, where the climbing routes start, sixteen cars have been counted whose owner has not yet been traced. The authorities, therefore, suspect that more deaths will be found.

Rescue teams are now using helicopters and drones with thermal cameras to locate any survivors in the mass of broken ice and rocks, said Canazei mayor Giovanni Bernard. But the chance of finding survivors is “almost zero,” said Giorgio Gajer, who is responsible for the rescue.

The disaster happened a day after a record temperature of 10 degrees was set on top of the glacier. On Monday, Italian Prime Minister Mario Draghi said the collapse could be linked to global warming. According to him, the disaster is “without a doubt” related to the “deterioration of the environment and the climatic situation,” Draghi said.