A former intelligence officer today suggested people have been murdered by the US government as part of the conspiracy to keep UFOs a secret in a bombshell hearing held by Congress. 

David Grusch - a former high-ranking intelligence official - is one of three military whistleblowers who testified under oath that they had firsthand encounters or knowledge about secret government programs involving technology that is 'non-human.'

He claimed that the US has been in possession of UFOs since 'the 1930s' and has been secretly back-engineering them and carrying out a public disinformation campaign to prevent the details from leaking publicly.

At one point during the first-of-its-kind hearing, Representative Tim Burchett (R-Tenn) asked Grusch: 'Personally, have you heard anyone [has] been murdered?' Grausch said: 'I have to be careful answering that question. I directed people with that knowledge to the appropriate authorities.'

Grusch was sworn in Wednesday, along with Ryan Graves, an esteemed former pilot, and Navy veteran fighter pilot Commander David Fravor, who witnessed the 2004 'Tic Tac' UFO.

Opening the hearing this morning, Rep Burchett promised their testimonies would be a landmark moment in uncovering 'the biggest cover-up in history.'