Swarms of killer AI drones might sound like the plot of a dystopian science-fiction thriller.

But in a terrifying glimpse of the future, one scientist has shown just how easy it already is to build an 'assassination drone' that can hunt down and kill people.

In just a few hours, Luis Wenus, an engineer and entrepreneur, converted a $115 (£89.99) drone into the basis of a deadly weapon.

Using AI facial recognition the drone was programmed to recognise individuals and race towards them at full speed.

Although Mr Wenus says he built the drone 'for a game' he also says he wanted to raise awareness for how easily this could be used for a deadly terrorist attack.