Authorities blamed the sun and a sudden spike in temperatures for melting the ice enough for it to detach.
The four climbers killed in Italy were scaling a waterfall in Gressony-Saint-Jean, in the Val d'Aosta region near the border with Switzerland, when part of the ice wall gave way.
A fifth climber survived, apparently because he already had reached a ledge above where the frozen waterfall cracked off, the head of the Val d'Aosta Alpine rescue service, Adriano Favre, told Italian media. Alpine teams rescued the survivor.
The climbers' bodies were brought to Briancon.
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