Britain's ballistic missile early warning base in Yorkshire tracked a UFO sparking a top-secret probe, it has been revealed.

Top brass at RAF Fylingdales, near Whitby, were baffled by the ‘unknown target’ and ordered an investigation.

The BMEWS base - part of the NORAD missile defence system - was famous for its three ‘golfball’ shaped radomes during the Cold War that were used to track missiles fired from the Soviet Union.

They would give a dreaded ‘four-minute warning’ of any incoming attack.

But UFOs often popped up on the radar screens, it can be revealed.

To read more, click here.