Father of UK Islamic State fanatic 'who was part of ISIS death squad' that beheaded 17 Syrian soldiers disowns him after video..saying his jihadi son should be executed

Nasser Muthana's father Ahmed said his son, a 20-year-old medical student from Cardiff, should face death if he was involved in a sickening ISIS beheading video (pictured). Mr Muthana said his son (inset) deserved to die because it would be a 'head for a head'. Analysts examining the video believe the jihadis - led by the Briton known as Jihadi John - are from at least six countries. David Cameron last night claimed the 'sick terrorists' of IS must face the 'justice they deserve' including charges of treason.