Reaction to North Korea's nuclear test -- its third since 2006 -- poured in Tuesday from around the world:
Barack Obama, U.S. president:
"This is a highly provocative act that ... undermines regional stability, violates North Korea's obligations under numerous United Nations Security Council resolutions, contravenes its commitments under the September 19, 2005 Joint Statement of the Six-Party Talks, and increases the risk of proliferation.
North Korea's nuclear weapons and ballistic missile programs constitute a threat to U.S. national security and to international peace and security. The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region."
"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies."
Statement from the office of Ban Ki-moon, U.N. secretary-general:
"The Secretary-General condemns the underground nuclear weapon test conducted by the Democratic People's Republic of Korea (DPRK) today. It is a clear and grave violation of the relevant Security Council resolutions.
It is deplorable that Pyongyang defied the strong and unequivocal call from the international community to refrain from any further provocative measures. The Secretary-General had repeatedly called on the new leadership in Pyongyang to address international concerns and start building confidence with neighbouring countries and the international community.
The Secretary-General is gravely concerned about the negative impact of this deeply destabilizing act on regional stability as well as the global efforts for nuclear non-proliferation. He once again urges the DPRK to reverse course and work towards de-nuclearization of the Korean peninsula.
The Secretary-General is confident that the Security Council will remain united and take appropriate action. In the meantime, the Secretary-General remains in close contact with all concerned parties and stands ready to assist their efforts."
Shinzo Abe, Japanese prime minister:
North Korean's decision to conduct a third a nuclear test is "extremely regrettable," and Tokyo will "strongly" protest it.
William Hague, British foreign secretary:
The United Kingdom calls for a "robust response" from the international community and the U.N. Security Council after North Korea's latest nuclear test.
Bob Carr, Australian foreign affairs minister:
"The Australian government condemns in the strongest possible terms nuclear testing by North Korea.
Nuclear testing by North Korea clearly violates United Nations Security Council resolutions ... which demand North Korea not conduct any further nuclear tests.
North Korea's development of nuclear weapons and missiles and its proliferation of sensitive technologies threaten international peace and security."