ISIS Bride Shamima Begum Not Allowed to Return to UK: Top Court The UK Supreme Court ruled on Friday that Shamima Begum, who left the UK for Syria to join the ISIS terrorist group as a teenager, is not allowed to return and fight her citizenship case because she poses a security risk. Begum, who has dual British-Bangladeshi citizenship, travelled to Syria at the age of 15, along with some other classmates, to join the so-called ISIS caliphate. As the caliphate was being whittled down to its last survivors by U.S. and allied forces, she surfaced at a refugee camp in Syria, where she caught the interest of Western journalists.