"The two Prime Ministers condemned in the strongest terms North Korea's continued development of its nuclear weapons and ballistic missile programs, including the latest nuclear test conducted by North Korea on 3 September as well as its uranium enrichment activities", the statement said.
"A telling blow should be dealt to them who have not yet come to senses after the launch of our ICBM over the Japanese archipelago", said the spokesman, whose committee is an affiliate of North Korea's ruling Workers' Party.
Initial official estimates put the explosive yield at around 150 kilotons, but the bomb may have been much larger. The analysts gave no indication that a test appeared to be imminent.
Similarly, US monitor, which also keeps a tab on Pynogyang activities, said the recent nuclear test caused 6.3-magnitude quake in North Korea, the tremors of which were also felt in China and Russian Federation, possibly due to a rock cave-in.
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Writing for 38 North, the Johns Hopkins University website dedicated to North Korea issues, analysts Frank V. Pabian, Joseph S. Bermudez Jr. and Jack Liu say North Korea's site now has "additional slippage" in "pre-existing landslide scars" and a "possible subsidence crater".
The agency says it couldn't verify exactly what kind of nuclear bomb the North detonated as it hasn't found several other radioactive isotopes that typically accompany a nuclear explosion.
"No way... A use of military force, but that would result in a second Korean war".
North Korea's tests have inched the country closer to producing nuclear-tipped weapons that could one day reach the American mainland. The country is also developing solid-fuel missiles that could be fired from land mobile launchers or submarines. Those three prongs - ground, air, and submarine - constitute what the military calls its nuclear triad. "If I want to send the most compelling message, I have been persuaded that the triad in its framework is the right way to go", Mattis said.
The North Korean gross domestic product (GDP) in 2016 was $28.50 billion, according to the Bank of Korea in Seoul.
The North claimed to have carried out a hydrogen bomb test. With the current missile inventory, it could also target larger areas.