British Prime Minister David Cameron has announced new plans to combat the increasing numbers of radicals from the UK fighting in Syria and Iraq - and those returning home.
He says border officials will be given new powers to seize passports from Britisn nationals traveling abroad to fight.
Mr Cameron says powers to monitor terror suspects in the UK will also be increased.
It follows the suspicion a Briton was involved in the beheading of US journalist James Foley.
Hundreds of British nationals are known to have traveled to Syria and Iraq to fight with militants.
So there has been increasing international pressure for David Cameron to act.
Olly Barratt reports from London.
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David Cameron - back in parliament after a summer recess - and straight down to business.
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The number one fear is that radicals - some of whom have already returned to the UK after fighting in Syria and Iraq - may now plan attacks on British soil.
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Because Mr Cameron says there have been blind spots in the UK's ability to deal with extremists.
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Because the radicalisation of a small minority of young Muslims is a complicated issue which could take years to tackle.
And there are concerns - notably from David Cameron's own coalition partners the Liberal Democrats about the human rights implications of trying to revoke citizenship for jihadists.
But could Mr Cameron's moves be a step towards the eventual involvement of the UK in military action in the region? Perhaps not with a general election due in May, according to political analyst Paul Osborne.
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"You don't know how long it's going to last, you don't know how well it's going to go, it could be very quick, or it could be very long, and that uncertainty means he will be reluctant to get involved, however much pressure he might come under from the United States."
Either way - the government is describing this as a 'generational struggle' - it won't be solved overnight by new anti-terror powers.
Olly Barratt, London