From Sky News:
Foreign Secretary William Hague has said a number of Britons are fighting with ISIS, the extremist group that has taken over large parts of Iraq.
Mr Hague told the Commons about 400 UK-linked nationals were involved in the conflict in neighbouring Syria and some of them were "inevitably" fighting for the Islamic State in Iraq and Syria (ISIS).
Mr Hague said: "We estimate the number of UK-linked individuals fighting in Syria to include approximately 400 British nationals and other UK linked individuals who could present a particular risk should they return to the UK, and some of these inevitably are fighting with ISIL (ISIS)."
Not a big problem is it? If people with British passports go to join a terrorist group, just cancel their passports and don't let them back into the UK.
It can't be that difficult to work out who's become a terrorist, there's a checklist i.e. male; Muslim; traveling to Middle East; alone or with other males; cannot give plausible reason why they are going and back this up with some evidence; away for longer than a week etc.
Anybody who ticks enough of those boxes has his passport cancelled and is refused re-entry to the UK. There'll be a few false positives, but that's life.
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