(Reopens FGN 4)

"For now, further data and analysis are necessary to establish what kind of event this is. If confirmed as a nuclear test, this act would constitute a clear threat to international peace and security, and challenges efforts made to strengthen global nuclear disarmament and non-proliferation, in particular by ending nuclear testing," ToTh said. Russia condemned the test saying Moscow considered it a violation of UN Security Council resolution. "We condemn these actions by North Korea and see them, along with the recent ballistic rocket satellite launch, as a violation of corresponding UN Security Council resolutions," a foreign ministry source was quoted by Interfax news agency as saying. The UNSC ordered emergency talks today on the nuclear weapon test. The US Geological Survey said it detected a 4.9-magnitude tremor at 11:58 am local time in North Korea. Bruce Klingner, senior research fellow for Northeast Asia in the Asian Studies Center at The Heritage Foundation said that Pyongyang has once again flouted international efforts to rein in the recalcitrant regime by conducting a nuclear test. "What is clear is that North Korea has again defied the UN Security Council as well as renewed efforts by China to prevent its troublesome neighbour from ratcheting up tension on the Korean Peninsula. Kim Jong-un has shown himself to be no less belligerent or dangerous than his predecessors," he said in a statement. "The magnitude of the event is larger than North Korea's two previous nuclear tests. The South Korean Ministry of Defense preliminarily concluded the test may have been 6 kilotons or larger. One nuclear expert assessed it could have been 10 kilotons, significantly larger than the 2006 and 2009 tests which were 1 kiloton and 4 kilotons, respectively," Klingner said.