"They were in the wrong place at the wrong time" – watch the dramatic helicopter rescue of mountaineers injured by avalanche in the Scottish Highlands

Cairn Toul in the Cairngorms.

Two climbers had to be rescued in Cairngorms National Park, after being hit by falling snow and ice from a collapsing cornice above them.

These overhanging masses of snow can become unstable and break off, and can also trigger avalanches.