by: Jethro Mullen | CNN

(CNN) -- A BBC journalist who got into North Korea by using a group of students from a top British university as camouflage is facing accusations that he recklessly endangered their safety and damaged the school's reputation.

BBC reporter John Sweeney posed as a student from the London School of Economics and Political Science, or LSE, on a visit to the secretive nation last month, during which he filmed footage for the broadcaster's prime-time current affairs show "Panorama."