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David Cameron said there would be new legislation to make it easier to take passports away from people who would travel abroad to fight.
Prime Minister David Cameron said IS poses a "greater and deeper threat to our security than we have known before" claiming the UK must confront the terrorist group's ideology.
PM on ISIL threat: We cannot appease this ideology, we have to confront it at home and abroad.
"The ambition to create an extremist caliphate in the heart of Iraq and Syria is a threat to our own security here in the UK," David Cameron said.
The UK's "severe" terror threat level is now the second highest of five categories.
- Critical - an attack is expected imminently
- Severe - an attack is highly likely
- Substantial - an attack is a strong possibility
- Moderate - an attack is possible but not likely
- Low - an attack is unlikely
Nato Secretary-General Anders Fogh Rasmussen accuses Russia of a "blatant violation of Ukraine's sovereignty".
Hospital food standards are being shaken up so that from now on, those in England will be forced to provide better food. They need to provide more water, more fish, and more fruit and vegetables, and use less salt.
Hospitals will then be ranked on the quality of food - but campaigners say the new standards should be legally binding.
ITV News reporter Lucrezia Millarini has the details:
Roger Lord, who had been the Ukip general election candidate for Clacton until Douglas Carswell jumped ship yesterday, has called the Tory defector an "idiot".
"If somebody pushes me, I'm going to push back," he said. "Has he [Carswell] got a membership card? I'm not sure he's officially a member yet."
Mr Lord told ITV News Political Correspondent Libby Weiner that Mr Carswell "could have said sorry, but he hasn't got the guts to do it".
It is an unsettled day across the UK with quite a few showers around and chilly temperatures, although it will be dry and bright in the East.
Prime Minister David Cameron has said he will make a statement on raising of the UK Threat Level from international terrorism to Severe at 2.45pm.
I'll be making a statement on the raising of the UK Threat Level from international terrorism to Severe at 2.45pm.
Alex Salmond said the Yes campaign remained the underdog in the run-up to the September 18 referendum, despite a new poll showing an increase in support.
The First Minister said it was "comforting and encouraging" that the No campaign's lead had been cut to just six percentage points, according to a Survation poll for the Scottish Daily Mail.
However, Mr Salmond stressed: "The polls are with us, but we're not there yet, we're still behind, we're still the underdogs, we've still got work to do, we're still trying harder ... to convince our fellow citizens that Yes offers the right vote for the future."
He also joined the Prime Minister in condemning the Yes supporter who pelted Scottish Labour MP Jim Murphy with eggs in Kirkcaldy, Fife yesterday.