Pakistan is building a security barrier along its north-western border with Afghanistan. A third of the 2,600-kilometre fence has already been completed. Pakistan says it has also installed surveillance technology aimed at monitoring cross border movement and thwarting future attacks from Afghanistan. Al Jazeera's Hashem Ahelbarra. - Subscribe to our channel: http://aje.io/AJSubscribe - Follow us on Twitter: https://twitter.com/AJEnglish - Find us on Facebook: https://www.facebook.com/aljazeera - Check our website: https://www.aljazeera.com/ #Pakistan #Afghanistan #PakistanAfghanistanBorderFencing