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Britain's Prime Minister David Cameron speaks at a news conference at 10 Downing Street in central London August 29, 2014. Cameron spoke after the country's terror threat risk level was raised to 'severe' due to fears over the situation in Iraq and Syria. AFP PHOTO / POOL / PAUL HACKETT (Photo credit should read PAUL HACKETT/AFP/Getty Images)
Britain's Prime Minister David Cameron speaks at a news conference at 10 Downing Street in central London August 29, 2014. Cameron spoke after the country's terror threat risk level was raised to 'severe' due to fears over the situation in Iraq and Syria. AFP PHOTO / POOL / PAUL HACKETT (Photo credit should read PAUL HACKETT/AFP/Getty Images)

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    UK: 'Terrorist attack is highly likely'

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UK: 'Terrorist attack is highly likely'

British Home Secretary says there's no intel of an imminent attack, but an attack is still likely. Karl Penhaul reports.

UK: 'Terrorist attack is highly likely'

British Home Secretary says there's no intel of an imminent attack, but an attack is still likely. Karl Penhaul reports.