A Cardiff county resident has been added to a UN sanctions list containing four other British citizens fighting with Islamic State (IS) militants in Syria, the media reported.
Aseel Muthana, 19, has been put on the same list as his older brother, Nasser, 21, who achieved notoriety when he appeared in an IS propaganda video entitled "There is No Life without Jihad", The Guardian reported.
The three others are Aqsa Mahmood, 21, from Glasgow; Omar Hussain, 28, from High Wycombe and Sally-Anne Jones, a 46-year-old Muslim convert from Chatham, Kent. All have had travel bans and asset freezes imposed on them.
The five Britons on the list are thought to be in Raqqa, the de facto IS capital on the banks of the Euphrates river in Syria.