"Ghassan said his 30-year-old son was kidnapped in 2013 by the Free Syrian Army, a loose coalition of opponents to Bashar Assad's regime.
After six months he was handed over to the al-Qaida-linked al-Nusra Front.
"We paid a ransom to the al-Nusra Front. But they tortured him and sold him to Daesh (IS) who decapitated him," he said."
