Xinhua recently reported that, based on information provided by South Korean media, South Korean authorities obtained intelligence indicating that North Korea is preparing for another nuclear test. Transportation activities at the same nuclear test site have been discovered and they match the pattern of the preparation work done before previous tests. Sources from the South Korean military suggested that they believe a new nuclear test is ready, pending only a political decision. The Xinhua report also mentioned an Agence France-Presse news piece suggesting that, according to a U.S. think tank, North Korea is preparing a long-range missile launch.
Source: Xinhua, February 17, 2013
http://news.xinhuanet.com/world/2013-02/17/c_124351493.htm