“Why did you kill my son?” yells Fatima Khan, the grieving mother of British doctor Abbas Khan who was killed in Syria, at regime officials who were in Geneva for peace talks aimed at ending the country's civil war. Dr Khan had traveled to Syria to provide humanitarian aid in Aleppo, and according to his mother, was killed because “he entered Syria illegally.”

The video, uploaded on YouTube by newutopiacity1 (subtitled in Arabic), shows Mrs Khan confronting Syrian regime officials about the death of her son in Syrian custody on December 16, 2013.