Another report by the U.S.' National Security Strategy published Monday stated that biological weapons being developed by North Korea could be delivered by missiles, triggering fears of a potential biological war.
On Tuesday, Bloomberg reported that South Korean intelligence officials have warned North Korea is working on a program to prevent anthrax from disintegrating at the kinds of high temperatures that would be experienced during an ICBM's re-entry of Earth's atmosphere from space.
"North Korea-a country that starves its own people-has spent hundreds of millions of dollars on nuclear, chemical, and biological weapons that could threaten our homeland", the document states.
One interesting nugget in the report on top of this is that the USA and its ally South Korea appear to have known about this since 2004, as the nations have vaccinated soldiers against anthrax since then.
North Korea has been developing its missile program for decades, and a test last month let the world know that it has the U.S. East Coast within range of its latest Hwasong model. President Donald Trump has engaged in bellicose rhetoric with the North Korean leader, who has referred to him as a "dolt".
Photo released on November 30 by North Korea's official Korean Central News Agency (KCNA) shows launching of the Hwasong-15 missile, which is capable of reaching all parts of the US.
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Because they can survive in such harsh climates, Anthrax spores have been weaponised by at least five countries: Britain, Japan, the United States, Russia and Iraq.
In its response, North Korea said the claims in the report were "the US stereotyped method to cook up untruths as truths, stubbornly insisting that black is white and fabricating anything for satisfying their aggressive greed".
It is not only Trump railing against the North Korean despot. North Korea is the only nation among the combatants that still clings to these claims.
According to the newspaper, an unconfirmed intelligence report claims North Korea has already successfully tested such a warhead under those conditions.
South Korea assessed the missile - North Korea's largest yet - could potentially fly 13,000 kilometres and reach Washington.
China believes the system's powerful radar can see far into its territory, but Seoul argues it needs it to guard against the threat posed by North Korea's missile and nuclear programmes.