Report: North Korea believed to be preparing for September nuclear weapon test

North Korea is believed to be preparing for a nuclear weapons test that could come as soon as September 9, reports the Daily Star.

That date coincides with a national holiday there and marks one year since the isolated Asian country last detonated a nuclear device at its Punggye-ri underground site.

The information comes from South Korea’s intelligence community, which reports that activity at the underground location has been detected. 

RELATED: Everything you didn't know about Kim Jong Un

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Everything you didn't know about Kim Jong Un
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Everything you didn't know about Kim Jong Un

1. While Kim Jong Un's birthday on January 8 is a national holiday, it is unknown exactly how old the North Korean leader is. It's widely believed he is in his early-mid thirties. In 2016, the U.S. Treasury Department listed his birth year as 1984 when they placed sanctions on North Korea.

 (KCNA via REUTERS)

2. Kim Jong Un is the world's youngest leader, according to the date listed by the Treasury. 

(STR/AFP/Getty Images)

3. Kim Jong Un is very passionate about basketball. He is reportedly a big fan of Michael Jordan and has a friendly relationship with Jordan's former Chicago Bulls teammate Dennis Rodman. Rodman has visited the secluded nation multiple times and even sang him "Happy Birthday" before an exhibition game in Jan. 2014. 

(REUTERS/KCNA)

4. Kim Jong Un reportedly has a love for smoking, whiskey and cheese

(KCNA/via Reuters)

5. Kim Jong Un's older half-brother Kim Jong Nam was killed in Feb. 2017 by two women who smeared VX nerve agent on his face at an airport in Kuala Lumpur. The women were arrested following his death. Many believe the hit was directed by North Korea. 

(KCNA; REUTERS)

6. Kim Jong Un has two college degrees. One is in physics from Kim il Sung University and another as an Army officer obtained from the Kim Il Sung Military University.

(KCNA/REUTERS)

7. Kim Jong Un attended boarding school in Switzerland. It is widely disputed how much time he spent at the school. Most reports say he was abroad from 1998-2000. 

(KCNA/REUTERS)

8. Kim Jong Un is the only general in the world that does not have any military experience. 

(KCNA/REUTERS)

9. He married Ri Sol Ju in 2009. The couple has at least one daughter named Ju Ae. 

(KCNA/REUTERS)

10. Kim Jong Un had his uncle Jang Song Thaek arrested and executed for treachery in 2013. 

(REUTERS/Kyodo)

11. Kim Jong Un hand selected North Korea's first all-female music group -- Moranbong Band. They made their debut in 2012. 

(ED JONES/AFP/Getty Images)

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News of the potential test comes as military from the U.S. and South Korea participate in an annual readiness training.

North Korean officials have voiced opposition to that exercise, with one telling CNN, it comes at the “worst possible moment" in regards to relations with South Korea and the U.S. 

It was also noted that signs of escalation will be met with, “catastrophic consequences, the Americans would be wholly responsible." 

Just days ago, North Korea fired three short-range test missiles, though none were successful, reports the Associated Press. Two experienced failures while in flight, and the other is said to have exploded shortly after launch.

RELATED: How to survive a nuclear attack

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How to survive a nuclear attack

What should you do in the event of a nearby nuclear attack? Click through to learn more. 

(Photo by Lambert/Getty Images)

Seek shelter immediately, towards the center of a building or -- preferably -- a basement. Aim for the same type of shelter you would utilize in the event of a tornado. 

(Photo via Getty Images)

The next three slides are examples of nuclear shelters that exist around the world. 

(Image via Lawrence Livermore National Laboratory)

The entrance of Shelter Co.'s nuclear shelter model room, which is placed in the basement of the company's CEO Seiichiro Nishimoto's house, is pictured in Osaka, Japan April 26, 2017. (Photo via REUTERS/Kim Kyung-Hoon)
A fallout shelter sign hangs on the Mount Rona Baptist Church, on August 9, 2017 in Washington, DC. In the early 60's Washington was at the center of civil defense preparations in case of a nuclear blast, with over one thousand dedicated public fallout shelters in schools, churches and government buildings. (Photo by Mark Wilson/Getty Images)
A 'shelter' sign is displayed at the entrance to a subway station in Seoul on July 6, 2017 in Seoul, South Korea. According to the metropolitan government, South Korea's city subway stations serve a dual purpose with over 3,300 designated as shelters in case of aerial bombardment including any threat from North Korea. The U.S. said that it will use military force if needed to stop North Korea's nuclear missile program after North Korea fired an intercontinental ballistic missile on Tuesday into Japanese waters. The latest launch have drawn strong criticism from the U.S. as experts believe the ICBM has the range to reach the U.S. states of Alaska and Hawaii and perhaps the U.S. Pacific Northwest. (Photo by Chung Sung-Jun/Getty Images)

Dense materials, including dirt or thick walls, provide the best defense to fallout radiation.

(Photo via Getty Images)

If possible, take a warm shower -- but do not use conditioner, as it can bond to nuclear particles. 

(Photo via Getty Images)

Do not seek shelter in a car, as they won't provide adequate protection, and you should not attempt to outrun nuclear fallout. 

(Photo by Noel Hendrickson via Getty Images)

The nuclear fallout zone shrinks quickly after an attack, but the less dangerous "hot zone" still grows. 

(Image via Lawrence Livermore National Laboratory)

Once you are sheltered, do not leave. Listen to a radio or other announcements. 

(Photo via Getty Images)

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