Three people have died in a horror helicopter crash in the Swiss Alps, while three more have been injured.

       Emergency services rushed to the scene around 9.30am local time on Tuesday morning.

       The aircraft slipped down a slope after landing at the summit on the Petit Combin mountain in Valais. The aircraft was taking skiers "heli-skiiing" - where skiers go off-piste after being dropped off by a helicopter instead of a conventional lift.

       At the time of the crash, four tourists and a mountain guide were inside the helicopter alongside a pilot.

       The identities of the deceased are not yet known. Neither is the seriousness of the survivor's injuries.

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