Iranian nuclear scientist hanged for treason

Iran has confirmed the execution of a scientist who provided information about the country’s nuclear programme to the United States. Shahram Amiri's death is part of a long-running espionage saga between the US and Iran. Al Jazeera’s Gerald Tan explains. - 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: http://www.aljazeera.com/