North Korea collapses tunnels at nuclear test site: media reports

SEOUL, May 24 (Reuters) - North Korea followed through on a pledge to blow up tunnels used for nuclear testing on Thursday, South Korean media reported, as part of steps that have reduced tension on the Korean peninsula and raised the possibility of a summit with the United States.

North Korea has conducted all six of its nuclear tests at the Punggye-ri site, which consists of tunnels dug beneath Mount Mantap in the northeast of the country.

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Trump welcomes home 3 US prisoners freed by North Korea
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Trump welcomes home 3 US prisoners freed by North Korea
JOINT BASE ANDREWS, MD - MAY 10: U.S. President Donald Trump applauds the three Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who have been detained in North Korea. (Photo by Mark Wilson/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: President Donald Trump greets the three Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim, on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who had been detained for up to two years. The three U.S. citizens have been released as a goodwill gesture ahead of a planned summit between Trump and Kim Jong Un. (Photo by Mark Wilson/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: Secretary of State Mike Pompeo (R), greets three Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim, as President Donald Trump stands nearby, at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who had been detained for up to two years. The three U.S. citizens have been released as a goodwill gesture ahead of a planned summit between Trump and Kim Jong Un. (Photo by Mark Wilson/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: U.S. President Donald Trump walks with the three Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who had been detained for up to two years. The three U.S. citizens have been released as a goodwill gesture ahead of a planned summit between Trump and Kim Jong Un.(Photo by Mark Wilson/Getty Images). (Photo by Mark Wilson/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: U.S. President Donald Trump walks with the three Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who have been detained in North Korea. (Photo by Mark Wilson/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: U.S. President Donald Trump speaks while standing with the three Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim, as Secretary of State Mike Pompeo stands nearby, at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who had been detained for up to two years. The three U.S. citizens have been released as a goodwill gesture ahead of a planned summit between Trump and Kim Jong Un.(Photo by Mark Wilson/Getty Images). (Photo by Mark Wilson/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: Secretary of State Mike Pompeo stands with two Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who had been detained for up to two years. The three U.S. citizens have been released as a goodwill gesture ahead of a planned summit between Trump and Kim Jong Un.(Photo by Mark Wilson/Getty Images)
US President Donald Trump (L) applauds as US detainee Kim Dong-chul (2nd R) gestures upon his return with Kim Hak-song (behind) and Tony Kim (2nd L) after they were released by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: U.S. President Donald Trump applauds the three Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who have been detained in North Korea. (Photo by Mark Wilson/Getty Images)
JOINT BASE ANDREWS, MD - MAY 10: U.S. President Donald Trump stands with Americans just released from North Korea, Kim Dong Chul, Kim Hak-song and Tony Kim, as Secretary of State Mike Pompeo stands nearby, at Joint Base Andrews on May 9, 2018 in Maryland. Secretary of State Mike Pompeo traveled to North Korea and returned with the three men who had been detained for up to two years. The three U.S. citizens have been released as a goodwill gesture ahead of a planned summit between Trump and Kim Jong Un.(Photo by Mark Wilson/Getty Images). (Photo by Mark Wilson/Getty Images)
US President Donald Trump (C) speaks upon the return of US detainees Kim Dong-chul (3rd R), Kim Hak-song (R) and Tony Kim (2nd L) after they were released by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump (C) speaks upon the return of US detainees Kim Dong-chul (4th L), Kim Hak-song (3rd R) and Tony Kim (3rd L) after they were released by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump (L) applauds as US detainee Kim Dong-chul (2nd R) gestures upon his return with Kim Hak-song (behind) and Tony Kim (2nd L) after they were released by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump (L) and wife Melania Trump (2nd L) walk with US detainees Tony Kim (2nd R), Kim Hak-song (R) and Kim Dong-chul (C) upon their return after they were released by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump (L) applauds as US detainee Kim Dong-chul (2nd R) gestures upon his return with Kim Hak-song (hidden behind) and Tony Kim (2nd L) after they were released by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
WASHINGTON, DC - MAY 10: President Donald J. Trump disembarks a plane with first lady Melania Trump and three freed American prisoners after their arrival from North Korea at Joint Base Andrews on Thursday, May 10, 2018 in Joint Base Andrews, MD. The prisoner release appears to be a gesture to set the stage for a landmark summit between President Donald J. Trump and Kim Jong Un. (Photo by Jabin Botsford/The Washington Post via Getty Images)
US President Donald Trump (R) shakes hands with US detainee Tony Kim (C) as US Vice President Mike Pence (back L) and Melania Trump (L) look on, upon arrival after three detainees were freed by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump (C) speaks upon the return of US detainees Kim Dong-chul (3rd R), Kim Hak-song (R) and Tony Kim (2nd L) after they were released by North Korea, at Joint Base Andrews in Maryland on May 10, 2018. - US President Donald Trump greeted the three US citizens released by North Korea at the air base near Washington early on May 10, underscoring a much needed diplomatic win and a stepping stone to a historic summit with Kim Jong Un. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
U.S. President Donald Trump, left, gives a thumbs-up as he walks with First Lady Melania Trump on the South Lawn of the White House after landing on Marine One following an event at Joint Base Andrews in Washington, D.C., U.S., on Thursday, May 10, 2018.Trump�personally welcomed home three Americans released from detention in North Korea, a triumphant middle-of-the-night moment for the president as he prepares for a landmark summit with�Kim Jong Un. Photographer: Yuri Gripas/Bloomberg via Getty Images
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(Reporting by Joyce Lee Editing by Robert Birsel)

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