North Korea appears to have blown up tunnels at its only nuclear test site, as peace and security summit with the U.S nears.
Foreign journalists at the Punggye-ri nuclear testing site in the north-east said they witnessed a huge explosion.
Pyongyang offered to destroy the site earlier this year as part of a diplomatic rapprochement with South Korea and the US.
Independent inspectors were not allowed to witness the process of the dismantling of the Punggye-ri site in the mountainous region of the country, and some worry it could be easily reversible, the BBC’s Laura Bicker reports.
US President Donald Trump and North Korean leader Kim Jong-un plan to meet in Singapore on June 12.
Three tunnels were collapsed in a series of explosions in front of about 20 handpicked international journalists.
Two blasts were reportedly carried out in the morning, and four in the afternoon.