A magnitude 5.6 earthquake was detected in northern North Korea on Sunday, South Korea’s Yonhap News Agency reported. The U.S. Geological Survey measured the quake at magnitude 6.3.
The quake was detected at 12:36 p.m. in North Korea’s North Hamgyeong province, Yonhap reported, citing information from the Korea Meteorological Administration (KMA).
Reuters gave the location as 55 kilometers north northwest of Kimchaek, citing U.S. Geological Survey information. There were no immediate reports of damage or casualties, the news agency said.
South Korea’s presidential office said that North Korea may have conducted its sixth nuclear test, the news agency reported.
Japan’s Prime Minister Shinzo Abe quickly tweeted that if the quake was indeed a nuclear test by North Korea, it would be “absolutely unacceptable.”
The quake came just hours after the regime of leader Kim Jong Un bragged of developing a more advanced nuclear warhead, Britain’s Guardian reported. The epicenter of the quake was estimated to be at 10 kilometers underground, the U.S. Geological Survey said.
No immediate official confirmation came from the North Korean government.
The Kim regime has been engaged in a heated rhetorical battle with the United States in recent months – largely because of missile tests North Korea has conducted.