MYSTERIOUS “sonic booms” over Area 51 base have reignited claims the military site is part of a massive alien cover-up conspiracy.
The thumping sounds were heard immediately after two F-22 fighter jets flew over the airspace in Nevada, USA.
A clip posted on YouTube by UFO Seekers, near a weather station, shows the planes soaring through the skies at speeds of up to 1,500mph.
As one jet accelerates away, while leaving distinctive trails, two massive sonic booms are heard.
UFO Seekers have also highlighted what appears to be a burst of flames following the boom, reported the Daily Star.
YouTube commentators claimed that the jets were a smokescreen for work on extraterrestrial technology within the base.
They said “I think the regular fighter jets, F22’s etc, were there as a distraction, to cover for the real testing of experimental hypersonic aircraft.
“The burst of flame you captured is possible evidence of some type of Scram/Ram Jet type technology, maybe the cause of the double sonic boom?”
Another said: “Still waiting for the day for NASA and the whole world to officially tell us that extraterrestrial aliens have been living with us this whole time and that they are real.”
The US Air Force Base, around 80 miles from Las Vegas, is thought to be used for the development and testing of experimental aircraft.
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