LONDON, May 24, 2017 - An armed soldier stands guard outside the Houses of Parliament in London, Britain, on May 24, 2017. British Prime Minister Theresa May announced Tuesday night that the country's terror threat level has been raised from "severe" to "critical", its highest level.

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An armed soldier and an armed police officer patrol outside the Houses of Parliament

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An armed soldier and armed police officers stand guard outside the Houses of Parliament

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