The Joint Chiefs of Staff (JCS) said it detected the launch from an area in or around Taechon, North Pyongan Province, at 6:53 a.m. It provided no further details immediately.
"While strengthening our monitoring and vigilance, our military is maintaining a full readiness posture in close cooperation with the United State," the JCS said in a text message sent to reporters.
The launch followed reports that Pyongyang seems to be preparing to fire a submarine launched ballistic missile (SLBM).
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