When a family saw 20 to 30 flashing red and white lights zig-zag their way through the sky they captured the eerie scene on camera to prove it happened.
The parents and their child were backed up by police officers and a police helicopter team who also witnessed the weird UFO and a whirring noise.
The crew reported the incident – which happened at 2.25am on November 17, 2003 over Bromley, Kent – to Swanick air traffic control and RAF Neatishead.
Officials checked their radar coverage but it revealed nothing unusual.
Report documents from the time state: “A policeman sent to investigate confirmed the sighting. Objects were moving faster than any man-made aircraft.”
The files – released as part of thousands of pages disclosed today by the MoD - showed the police thought the lights might have been aircraft approaching Heathrow, but an audit of traffic by Swanick proved otherwise.