A thorny question

Rachel from North London has a must read piece on her blog, here's the start:

"If your job was to protect this country, and you found out that some people born in this country were going off to a different country ( say, a training camp in Pakistan)
to learn to use machine guns and rocket launchers, and intended after their training to attack UK targets and UK soldiers abroad, ( say, in Afghanistan and Iraq) but as far as you know (or hoped) they weren't actually going to attack UK soil, or at least, you had no conclusive proof of it what would you do? What should you do?"

Do read the rest, most thought-provoking...