Alpine rescue stations in the area have been activated, as more than a dozen people are still missing.
Canine units have been deployed and around five helicopters are patrolling the surrounds.
The operation was paused on Sunday night amid fears that more of the glacier would come away.
Though it is not clear was caused the collapse, the incident took place during a period of record temperatures, as Italy has been experiencing a heatwave since June.
Over the last few days, the temperatures on the mountain peak had topped 10 degrees Celsius.
Rescuers have told local news that “enormous chunks” of rock and ice had detached from the peak of the glacier and that the vision of dead bodies on the mountainside was “confronting”.
The injured have been flown to several hospitals in the regions of Trentino-Alto Adige and Veneto.
The National Alpine and Cave Rescue Corps have supplied the public with a phone number for friends and family to call in case of “failure to return from possible excursions”, as not everyone on the expedition has been accounted for.
