Mysterious ‘metamaterials’ which could come from crashed alien spacecraft are being stored by the American government, according to a former military intelligence official.

Luis Elizondo, who headed up the US Defense Intelligence Agency’s secret Advanced Aerospace Threat Identification Program (AATIP), said that the objects were stored in specially modified warehouses in Las Vegas.

The warehouse – run by aerospace billionaire Robert Bigelow – is under armed guard and fortified with concrete and barbed wire, the Sunday Times reported.

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