Oetzi the prehistoric iceman may not have been murdered, say scientists, who now believe he could be the world's first known mountaineering victim.

The ancient natural mummy was believed to have died 5,300 years ago when he was hit by an arrow during a hunting trip.

Scientists - who examined his frozen remains when they were discovered frozen in the Alps between the Austrian and Italian border 20 years ago - thought he had then been finished off with a vicious club blow to the head....