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People pay tribute after a wreath-laying ceremony, in front of the Allalin Glacier, to commemorate the 88 casualities at the Mattmark reservoir in Saas-Almagell, Switzerland, Sunday, August 30, 2015. On August 30, 1965, an ice avalanche from the Allalin Glacier descended onto the construction site of the Mattmark dam. 88 workers, mainly Italian citizens, were killed in the catastrophe. (KEYSTONELaurent Gillieron)