A British prison has become the world's first to use a new system designed to stop drones flying over perimeter walls to drop contraband into jails.

The device creates a 2,000ft (600m) shield around and above a prison that will detect and deflect the remote-controlled devices.

It uses a series of "disruptors", which are sensors to jam the drone's computer, and block its frequency and control protocols. The operator's screen will go black and the drone will be bounced back to where it came from.

Drones have become a major security problem in Britain's prisons and are increasingly used to smuggle in drugs, weapons, phones and other valuables.

The new system, called Sky Fence, is being introduced at Les Nicolles prison on Guernsey, where around 20 "disruptors" will be installed on the perimeter and inside.

The Channel Island jail was initially going to install a drone detection system, but went a step further to put in the technology that stops drones in-flight.