South Korea's defense ministry said a small amount of hydrogen may have been added to a device North Korea tested on Wednesday, media reported.
South says small amount of hydrogen may have been injected in North's device
North Korea announced early on Wednesday it had successfully conducted a hydrogen nuclear test.
"We will find out after closely analyzing it but we understand a small amount of hydrogen may have been added to the fourth nuclear test," ministry spokesman Kim Min-seok told reporters, according to the MoneyToday online news service.
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