South Korea's military "detected several unknown cruise missiles launched into the West Sea of North Korea at around 7am", Seoul's Joint Chiefs of Staff (JCS) said in a statement.
South Korean and United States intelligence agencies were "conducting a detailed analysis", the JCS said.
"Our military is cooperating closely with the US while strengthening surveillance and vigilance, and is closely monitoring North Korea's activities," it added.
Unlike for their ballistic counterparts, the testing of cruise missiles is not banned under current United Nations sanctions on Pyongyang.
Cruise missiles tend to be jetpropelled and fly at a lower altitude than more sophisticated ballistic missiles, making them harder to detect and intercept.
Recent months have seen a sharp deterioration in ties between the two Koreas, with both sides jettisoning key tension-reducing agreements, ramping up frontier security and conducting live-fire drills along the border.
Denne historien er fra January 31, 2024-utgaven av The Straits Times.
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Denne historien er fra January 31, 2024-utgaven av The Straits Times.
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