LONDON, ENGLAND - APRIL 15: A general view of the London School of Economics and Political Science on April 15, 2013 in London, England. The Director of the LSE has disclosed that some of the university's students who travelled to North Korea with the journalist John Sweeney, who was covertly making a documentary for the BBC Panorama programme, have received threats from North Korea since their return to the UK. (Photo by Oli Scarff/Getty Images)
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