The parents of the 21-year-old Oxford man dubbed "Jihadi Jack" tell the BBC's Victoria Derbyshire programme about the last time they spoke to their son.

Jack Letts is suspected of going to Syria to fight for so-called Islamic State - he claims he is opposed to IS and has left that area.

His parents, Sally and John Letts, are calling on the British authorities to do "whatever they can" to help him.

Watch the Victoria Derbyshire programme on weekdays between 09:00 and 11:00 on BBC Two and the BBC News channel.