A fifth British jihadi is facing an international travel ban after being added to the list of UK militants subject to United Nations sanctions.
Aseel Muthana joins his brother Nasser - who was named earlier this week - on the UN list.
A statement on the UN website said he had been listed for "participating in the financing, planning, facilitating, preparing, or perpetrating of acts or activities" in support of Islamic State (IS) - also referred to as Isil.
Aseel Muthana from Cardiff travelled to Syria in February last year to link up with his brother who had already gone to a join IS.
The statement said: "Aseel Muthana has confirmed via social media that he is a member of Isil and is working to 'spread the khilafaa (caliphate) in the Arab lands'.
"Aseel Muthana has spoken publicly in the British media since travelling to the Syrian Arab Republic and has confirmed his commitment to violent extremism, claiming that he is willing 'to die for the cause'."