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Agence France-Presse

China and Japan said on Monday they had not yet detected any atmospheric radiation from North Korea’s nuclear test, amid fears of a leak from a “cave in” during the underground blast.
Japan’s top government spokesman Yoshihide Suga told reporters there was “nothing special detected from monitoring posts across the country”, nor from air samples taken by the Air Self-Defence Force after Sunday’s blast.
China’s environment ministry said on Monday that radiation levels near its Korean border were also normal.
“Results of monitoring make clear that this North Korean nuclear test as of now has produced no effect on our nation’s environment or the public,” the ministry wrote on its official website.
Japanese defence minister Itsunori Onodera said on Sunday that Tokyo had deployed “sniffer” planes capable of detecting radioactive particles.
China and Russia unite against North Korean nuclear test
Fears of a leak from North Korea’s detonation of what it claimed was a hydrogen bomb came after Chinese monitors detected a second tremor soon after the initial earthquake triggered by the blast.
The monitors said the second tremor, of magnitude 4.6, could be due to a “collapse [cave in]”, suggesting the rock over the underground blast had given way.
The resulting explosion was considerably larger than previous tests and was felt by residents in Chinese cities hundreds of kilometres from the North Korean border.


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North Korea nuclear crisis

No radiation detected outside North Korea after nuclear test, say China, Japan

A bridge connecting China and North Korea in Dandong in Liaoning province. China has monitored radiation levels on the border since the latest nuclear test. Photo: AFP

No radiation detected outside North Korea after nuclear test, say China, Japan

Pyongyang claims to have tested a more powerful hydrogen nuclear bomb on Sunday