An earthquake measuring 4.9 magnitude has been detected in North Korea which, many nations say, could be an indication of another nuclear test.
North Korea last month threatened to carry out its third nuclear test despite the U.N. Security Council's warning of "consequences."
South Korean media reported that this seismic activity indicated that Pyongyang carried out the nuclear test it had announced last month.
The quake occurred at 11:57 a.m. Korean time, Reuters reported.
The - U.S. Geological Survey said that the epicenter of the quake was very close to the North's nuclear test site and was only one kilometer deep from the surface.
According to an AFP report, China's earth quake administration described the tremor as a "suspected explosion." Japan's meteorological Agency said that the tremor was "different from a normal earthquake," the BBC reported.
North Korean area is not prone to seismic activity.
The country conducted nuclear tests in 2006 and 2009 amid condemnations from the U.N.
"We believe that there is a possibility that North Korea carried out a nuclear test, looking at past cases," the BBC quoted Japanese government's spokesperson Yoshihide Suga as saying.
Reacting to the sanctions imposed by the U.N., North Korea said that it was planning to conduct a high level nuclear test in January. Japan, South Korea and the U.S. had asked Pyongyang to refrain from doing so. China, North Korea's closest ally, too had urged the former not to go ahead with the planned test.
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