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The helicopter was trying to land at Everest Base Camp

2 of 5
There was no hint of the disaster to come as it flew above a television crew

3 of 5
Suddenly, the helicopter banked sharply as the pilot lost control

4 of 5
It plunged into the ground behind a ridge, sending up a pall of smoke

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Shocked witnesses were quickly on the scene, pulling the survivors from the wreckage