In reply to goose299:
More details in the local paper:
http://www.ledauphine.com/haute-savoie/2014/08/13/chamonix-les-six-membres-...
Quickly translated:
The UCPA group (5 climbers and their experienced guide with a good knowledge of the terrain/route) had left the Argentière hut at 4am on Tuesday to climb the Aiguille d'Argentière via Flèche Rousse.
At 5pm the hut tenants called the PGHM and asked for a helicopter reconnaissance. Due to a thunderstorm, the search was postponed to the following morning. Bodies were then found and recovered.
Owing to the heavy snowfalls of the past few days, the hut guardians think the accident may have been caused by a wind slab avalanche.
An investigation in under way.