Armed police are today patrolling London's Eurostar terminal as security checks at ports and stations were ramped up in the wake of the gun massacre in Paris. The development came as the head of MI5 warned that the attack at the offices of Charlie Hebdo magazine was a 'terrible reminder of the intentions of those who wish us harm'. Home Secretary Theresa May chaired a meeting of the Cobra emergency committee this morning as British police and security agencies closely followed developments in France. Scroll down for video Armed officers are also on duty at the entrance to Horse Guards in central London, just a short walk from Downing Street and the Houses of Parliament
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Terror threat against Britain is 'severe' - meaning a attack is highly likely
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Border checks have been stepped up and armed police patrolling stations
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MI5 chief Andrew Parker says Britain has offered France 'full support'
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Home Secretary Theresa May chaired Cobra meeting in Whitehall
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David Cameron says gun attack on Paris magazine marks shift in threat
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Prime Minister warns 'there is no one single answer' to appalling attacks
The Government has sent a specialist counter terror police officer to Paris to beef up the UK's anti-terror team in @placeholder.
Mr @placeholder said: 'This is different from some of the plots that we have seen here in the UK from so-called home-grown terrorists.'