An MP has called for stricter border controls in Europe in the wake of the Paris attacks, which killed 130 people.
Keith Vaz, chair of the Home Affairs Committee, has hailed Europe's passport-free travel policy as "dead" - and added that everyone who enters Europe should be checked and fingerprinted.
He said that Britain needs to be "very careful" amid reports that one of the terrorists involved in the Paris attacks passed through Greece undetected.
Mr Vaz said Europe's current policy poses problems in identifying who are genuine asylum seekers and those who are returning from Syria.
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Speaking to the BBC, he said: "The reason why it becomes a problem in Calais and eventually in the UK is because people are able to cross the border between Turkey and Greece so freely.
"We don't know the difference between those who are genuinely seeking asylum and those who are economic migrants and those who are returning from Syria because they know this is one of the places that they can't be found."
He added: "What I think we should do is every single person who enters the European Union has got to be checked and fingerprinted and have got to be accounted for.
"Just because we have a mass movement of people does not mean that proper controls should not be brought into existence.
"One of the people involved in the Paris attacks apparently came through Greece as a result of first of all going to Syria fighting there and coming back, so we have to be very careful."