Cosmic sperm recovered from suspected UFO landing sites has gone missing, according to an award-winning investigator.

Russian biologist Yuri Simakov found identical tiny "reddish" orbs at two places witnesses reported seeing alien craft land near Moscow and 1,750 miles away in Kazakhstan.

He handed some of the samples to Emmy-winning US TV and radio broadcaster George Knapp, a UFO investigator, believing they were "some kind of biological agent" that could "sprout" into a "being or animal or plant".

Yuri, who called the spheres "cosmic sperm", asked George to have them analysed using Western technology.

George took "half the world's known supply of cosmic sperm" back to the US for testing.

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