Footage of a NORAD surveillance blimp after it became untethered from its mooring in Maryland, US.

Two F-16 jets were reportedly scrambled to track the NORAD (North American Aerospace Defense Command) spy aircraft, when it went on the loose on October 28.

However, the blimp was quickly got under control and brought down.

The footage in this video was filmed by nine-year-old Aidan Hock.