The missile was launched from an area called Panghyon in North Korea's western region and it flew about 500 km (300 miles), South Korean military says.
Three North Korean ballistic missiles were fired from a western region south of the North Korean capital, just after noon local time (0300 GMT).
The launch of SLBM by North Korea is seen as a threat to regional peace and stability as the distance covered by the projectile has far exceeded any previous SLBM tests.
The latest missile test has alarmed Tokyo, which has expressed its outrage, while also ramping up tensions with South Korea and the United States.
North Korea threatens ‘physical response' to deployment of THAAD anti-missile system in South Korea.
North Korea again unsuccessfully attempted to launch its medium-range Musundan ballistic missile on Monday, to the relief of its neighbours.
North Korea is reportedly preparing to repeat a new ballistic missile test after a previous attempt resulted in failure earlier this month.
South Korea says North Korea fires submarine-launched missile off its east coast
Seoul based media says North Korea has deployed one or two intermediate-range ballistic missiles on east coast
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