My jihadi son should be executed: Father of UK Islamic State fanatic 'who was part of ISIS death squad' that beheaded 17 Syrian soldiers disowns him after video British ISIS jihadist Nasser Muthana should face death, his father said Muthana is thought to be one of the killers in a sick ISIS beheading video Medical student from Cardiff 'must face up to what he has done' says father David Cameron claimed 'sick terrorists' could face charges of treason The British medical student suspected of involvement in an Islamic State death squad should face execution himself, his father said yesterday. Nasser...