apan Wednesday again upgraded its estimated size of North Korea's latest nuclear test to a yield of around 160 kilotons - more than ten times the size of the Hiroshima bomb.
This marked Tokyo's second revision higher after previously giving estimates of 70 and 120 kilotons.
Defence Minister Itsunori Onodera told reporters that his ministry's upward revision to 160 kilotons was based on a revised magnitude by the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO).
"This is far more powerful than their nuclear tests in the past," Onodera told reporters.
The US bomb that destroyed Hiroshima in 1945 carried a yield of 15 kilotons.