While the war continues in northern Iraq there is of course the concern that some jihadists will try to bring their fight to the streets of Britain.
When MPs return to the Houses of Parliament tomorrow the Prime Minister will outline tough new powers that he says the Government needs to keep Britain safe.
Those are thought to include a measure that could exclude even British nationals from returning to this country if they're thought to have been fighting in Syria.
That is something some MPs, including Liberal Democrats, say could break international law.
The PM wants to confiscate passports. But in Cardiff they want to solve extremism at it's roots - they just can't get the help to do it.
David Cameron has unveiled a series of new measures to combat the threat of terrorism.
Rumours suggesting London's Tube network will be targeted in a terrorist attack on Monday are "completely untrue", police say.