Issam Abuanza, 37 - who gained a licence to practise medicine in the UK in 2009 - left his Sheffield home, his wife and two children in 2014 to join Islamic State terrorist group.His sister Najla has told one of the news agencies that, his parents will never forgive him.
On social media, Dr Abuanza has said he wished that a Jordanian pilot burnt alive by IS had taken longer to die.
On his Facebook page he is pictured wearing doctors' scrubs and carrying a gun in a holster. He smiles as he raises his finger in the air - a symbolic gesture to represent the oneness of God that is commonly seen in the iconography of Islamic extremism.
Another image shows him in combat fatigues, cradling an automatic rifle and reading the Koran.
Dr Abuanza is a Palestinian doctor with British citizenship who spent seven years working for the NHS.
I learnt,he was being influenced on social media.
Parents,please,follow-up on what your lads do on social media.