A magnitude 5.6 earthquake was detected around North Korea's nuclear test site Sunday, South Korea's military said, in an indication of a possible nuclear test.

An artificial quake wave was detected around the Punggye-ri site in the North Hamgyeong Province, according to the Joint Chiefs of Staff. The military said it is analyzing whether the temblor came from a nuke test.

Seoul's weather agency said that the seismic wave was recorded at 12:36 p.m.

South Korea's presidential office said that North Korea may have conducted its sixth nuclear test. It called for a meeting of the National Security Council.

It came hours after North Korea claimed that it has developed a hydrogen bomb that can be loaded into a new intercontinental ballistic missile (ICBM).

Since 2006, North Korea has carried out five nuclear tests, including two last year. (Yonhap)

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