Dumont also mentioned the possibility that chemical and biological weapons might be used by the North in case of a conflict.
Seoul will also review "ultra powerful" punitive measures against North Korea, such as shutting off the oil supply to the country and a ban on the country's export of workers, in the event of further military provocations, the foreign minister said.
Dumont's letter comes in response to a request for information for "expected casualty assessments in a conflict with North Korea", spearheaded by Democratic House members Ted Lieu (D-CA), and Ruben Gallego (D-AZ).
Following the Pentagon report, 14 lawmakers - all Republicans except for one Democrat - joined Lieu and Gallego to urge Trump to quit making "provocative statements" about North Korea's leader that jeopardizes diplomatic efforts and puts U.S. troops at risk.
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There are 28,500 U.S. troops in South Korea and Seoul is home to a population of 25 million people.
The group of politicians, comprising of 15 Democrats and one Republican, described the assessment as "deeply disturbing" and said such an action "could result in hundreds of thousands, or even millions of deaths in just the first few days of fighting".
Thae's comments come ahead of President Donald Trump's five-nation trip to Asia that will include a stop in South Korea.
Lieu told The Washington Post "it's important for people to understand what a war with a nuclear power would look like".
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North Korea in July launched two intercontinental ballistic missiles apparently capable of reaching the US mainland.
A t a speech Sunday at Yokota Air Base in Fussa, Japan, Trump rallied the American service members and assured USA allies in the region that he had their backs in the face of the rogue regime's threats.
"We have not heard detailed analysis of expected United States or allied force casualties, expected civilian casualties, what plans exist for the aftermath of a strike - including continuity of the South Korean Government", stated Lieu and Gallego in their letter.
North Korea's recent actions, including several missiles that overflew Japan and Pyongyang's sixth and largest nuclear test, have raised the stakes in the most critical worldwide challenge of Trump's presidency. It was not pleasant for them, was it?' said Trump, who wore a leather bomber jacket as he addressed the troops. The situation worsened when Trump, during his first address to the United Nations General Assembly (UNGA), vowed to annihilate North Korea if it posed any threat to the USA and its allies, and called the Pyongyang leader "rocket man" on a suicide mission.
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