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The tremor was recorded at a depth of six miles (10 kilometres) on the east coast of North Korea.

USGS initially recorded the tremor at a magnitude of 5.2, but it was later revised amid World War 3 fears.

China's earthquake administration said it detected a 6.3 magnitude earthquake in Northeastern North Korea, calling it a "suspected explosion," it has been reported.

Recent tremors in North Korea have been caused by nuclear tests, experts have said.

There are no immediate reports of damage or casualties.