N Korea test 'little bit' smaller than Nagasaki in WWII

A nuclear test has been carried out in North Korea, Foreign Secretary William Hague described it as a "violation of United Nations Security Council resolutions".

A map of North Korea, where the test was carried out Credit: Daybreak

Speaking on Daybreak, security expert Dr Sally Leivesley said it is likely the blast was "a little bit" smaller than the one which flattened Nagasaki, in World War II.

She added that this could mean the test used the same sized capacity of weapons, and the possible use of rockets for delivery.