"Abu Muthanna al-Yemeni" (centre), believed to be Nasser Muthana, a 20-year-old from Cardiff. Photograph: Al Hayat Media Centre/AFP/Getty Images.
"Abu Muthanna al-Yemeni" (centre), believed to be Nasser Muthana, a 20-year-old from Cardiff. Photograph: Al Hayat Media Centre/AFP/Getty Images.