A top US intelligence officer claims World War II American forces retrieved a UFO that crashed in Italy in 1933 – and Italian researchers say they have the documents to prove it.

Former top National Reconnaissance Office staffer David Grusch shocked the world last month when he revealed he had blown the whistle in sworn testimony to Congress and government watchdogs, about an alleged secret US program that has obtained multiple 'non-human' flying saucers.

Grusch claims one of these alien spacecraft crashed in Northern Italy in 1933, and was secreted away by Fascist dictator Benito Mussolini, before it was captured by American forces at the end of World War II and shipped to the US.

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