Otto Frederick Warmbier (3rd R), a University of Virginia student who has been detained in North Korea since early January, attends a new conference in Pyongyang, North Korea, in this photo released by Kyodo February 29, 2016. Warmbier was detained for trying to steal a propaganda slogan from his Pyongyang hotel and has confessed to "severe crimes" against the state, the North's official media said on Monday. Warmbier, 21, was detained before boarding his flight to China over an unspecified incident at his hotel, his tour agency told Reuters in January. Mandatory credit REUTERS/Kyodo ATTENTION EDITORS - FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. MANDATORY CREDIT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN.