Four whistleblowers have testified to investigators they worked on a secret program to rebuild crashed .

The bombshell revelation came from one of America's top former intelligence officials who has called on world leaders to finally come clean about unexplained recovered wreckage.

Ex-US deputy assistant secretary of defence for intelligence Christopher Mellon, 65, who served under presidents Bill Clinton and George W Bush, said he has received reports that the government has engaged in a “reverse engineering project” involving UFOs.

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He said he personally had referred four witnesses to the defence department's All-domain Anomaly Resolution Office – aka AARO – which is probing 800 reported close encounters between military personnel and UFOs.

Each claimed to have knowledge of a secret program “involving the analysis and exploitation of materials recovered from off-world craft”.

Other sources had contacted him about an “alleged secret US Government reverse engineering program”, he told Politico.

Mr Mellon urged the government to make records of the program public.

He said the public “have a right to know the truth” about reverse-engineering of UFO debris and “can handle” information about extraterrestrial craft.

Disclosure of such information could help global leaders “...

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