The accident occurred on the Normal Route on Mont Dolent, on the only delicate section - the steep slope above col 3558. Reports suggest that the father Piet fell and then the children were pulled off one by one. The tragedy was witnessed by the mother of the family, Ada de Jong, who had been with the party but had retreated earlier and was watching the party when they fell. She was taken to hospital in shock.
Read Luca Signorelli's assessment of the route and conditions on this thread
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