North Korea insists it has a right to nuclear weapons North Korea says it has staged a "successful" underground nuclear test, prompting international condemnation. The state says it was more powerful than the previous one in October 2006. A number of external agencies have confirmed a powerful explosion took place, suspected to be associated with a nuclear test. US President Barack Obama described the North Korean action as a threat to international peace. Crisis talks were being held in South Korea. An emergency session of the UN Security Council is being convened by Russia, which currently occupies the council's rotating presidency. BBC world affairs correspondent David Loyn says North Korea appears to have moved from a posture of negotiation to confrontation over the nuclear issue. 'Safeguarding sovereignty' An official communique read out on North Korean state radio said another round of underground nuclear testing had been "successfully conducted... as part of measures to enhance the Republic's self-defensive nuclear deterrent in all directions". Please turn on JavaScript. Media requires JavaScript to play. It said the test had been "safely conducted at a new high level in terms of explosive power and control technology". The test would "contribute to safeguard the sovereignty of the country and the nation and socialism", the communique said. The North gave no details of the test location, but South Korean officials said that a seismic tremor was detected in the north-eastern part around the town of Kilju - the site of North Korea's first nuclear test. The US Geological Survey said a 4.7-magnitude quake was detected at 0054 GMT, 10km (six miles) underground. Geological agencies in both South Korea and the US said the tremor indicated a nuclear explosion. David Loyn, BBC world affairs correspondent Understanding the motivation behind the actions of this most secretive of powers is never easy, but North Korea does now appear to have moved from a posture of negotiation to confrontation. Two years ago North Korea agreed to close its main nuclear plant at Yongbyon and reveal its nuclear assets. But it has since refused to allow in inspectors, and has now withdrawn from all negotiations. Monday's tests come a little over a month after a test of a long-range missile that threatened Asia and could have reached the US. Neither pressure nor the offer of a large aid package have worked. When it meets later on Monday, the UN Security Council will issue a strong statement of condemnation. President Obama is threatening action, but there are very few options left short of war. In quotes: Reaction to N Korea test North Korea: engage, appease, oppose? Russian news agencies quoted the defence ministry as saying said its systems had detected a blast of "between 10 and 20 kilotons" - making it much bigger than the 2006 test, which the US said was less than a kiloton. Hours after the explosion North Korea test-fired three short-range missiles, South Korea's Yonhap news agency reported. Pyongyang has so far not commented on Yonhap's reports. The US state department said it was still analysing the available data from the test. But in a strongly worded statement, President Obama said the North's pursuit of nuclear weapons and ballistic missiles threatened peace and was in "blatant defiance of the United Nations Security Council". "The danger posed by North Korea's threatening activities warrants action by the international community. We have been and will continue working with our allies and partners in the six-party talks as well as other members of the UN Security Council in the days ahead," his statement said. A spokesman for the South Korean President Lee Myung-bak said the test was a "grave challenge" to international non-proliferation efforts, while Japan's Chief Cabinet Secretary Takeo Kawamura said any nuclear test by the North would be "unacceptable". Both have formed crisis management teams, and said they would ask for action from the UN Security Council. The UK Prime Minister, Gordon Brown, said he condemned the test "in the strongest terms" and said it would "undermine prospects for peace on the Korean peninsula". South Korea's stock market fell 4% on the news, over fears that regional tensions would rise. Rocket condemnation The North says it remains under military threat from its historic rival, South Korea, and South Korea's allies, primarily the US - citing such examples as the annual US-South Korean military exercises undertaken in South Korea. NUCLEAR CRISIS Oct 2006 - North Korea conducts an underground nuclear test Feb 2007 - North Korea agrees to close its main nuclear reactor in exchange for fuel aid June 2007 - North Korea shuts its main Yongbyon reactor June 2008 - North Korea makes its long-awaited declaration of nuclear assets Oct 2008 - The US removes North Korea from its list of countries which sponsor terrorism Dec 2008 - Pyongyang slows work to dismantle its nuclear programme after a US decision to suspend energy aid Jan 2009 - The North says it is scrapping all military and political deals with the South, accusing it of "hostile intent" April 2009 - Pyongyang launches a rocket carrying what it says is a communications satellite 25 May 2009 - North Korea conducts a second nuclear test
N Korea a problem for Obama Timeline: North Korea It says it is entitled to retain a military deterrent. Last month, Pyongyang pulled out of six-party talks on its nuclear programme, in protest against international condemnation of its test-firing of a rocket on 5 April. The UN Security Council adopted a statement calling on North Korea to comply with a 2006 resolution banning missile tests. Pyongyang says its rocket carried a satellite, but several nations viewed it as cover for a missile test. The six-party talks - involving the US, China, Japan, Russia and the two Koreas - have stalled over the failure of Pyongyang to verify the shutdown of the Yongbyon nuclear plant. North Korea had agreed to dismantle the facility as part of an aid-for-disarmament deal and, in response, the US removed North Korea from its terrorism blacklist. But the North now believes it is no longer bound by its previous bilateral agreements with the US and agreements under the six-party talks, reports the BBC's John Sudworth in Seoul, South Korea. He says the North, which already faces a stringent sanctions regime, probably thinks it has little to lose.
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North Korea's official news agency is reporting that the country's government has carried out a "successful" test of a nuclear weapon. Yonhap News Agency in South Korea also reports the possible test.

Location of the test "According to the demand of our scientists and technicians, our republic has successfully conducted another underground nuclear test on May 25 ... as part of measures to strengthen its nuclear power in self-defense," said the Korean Central News Agency as quoted by Yonhap. North Korea claimed the test was 'part of the measures to bolster up its nuclear deterrent for self-defence'.

Yonhap says an "artificial earthquake" was detected that suggested a test had been conducted, but that the government was working to confirm the report. "The South Korean government is still trying to verify whether it in fact was a nuclear test, but it believes there is a possibility," said presidential office spokesperson Lee Dong-kwan. 

The United States Geological Survey (USGS) reported that at approximately 00:54:44 UTC, a magnitude 4.7 earthquake was detected 70 kilometers (45 miles) North, Northwest of Kimchaek, North Korea. South Korea reports the magnitude at a 4.5. North Korea previously conducted a nuclear test in 2006. That blast was measured at a magnitude 3.6.

South Korean officials have called an emergency meeting to discuss the event. South Korea has also banned its citizens from entering North Korea, except the Kaesong Joint Complex, from Tuesday. Russia is convening an emergency session of the United Nations Security Council on Monday. Japan's government has set up a special task force at the crisis management center in the prime minister's official residence.

South Korea, Japan, The People's Republic of China, the United States, Russia, and the European Union have all condemned the test. Russia, the US and the EU claimed the tests are a breach of United Nations' Security Council Resolutions. Iran has refused to condemn it, stating it was an "internal affair".