Dyatlov Pass Indicent: what slaughtered nine hikers on Siberia's Death Mountain in 1959?

Dyatlov Pass Indicent: what slaughtered nine hikers on Siberia's Death Mountain in 1959? | Mail Online: "The official Soviet investigator into the tragedy, Lev Ivanov, could find no answers. He concluded in his hastily composed report that all nine deaths had been caused by what he described as ‘an unknown elemental force which they were unable to overcome’. Privately, he told people he thought they’d been killed by aliens in a UFO."