A day after North Korea fired a barrage of 17 missiles and more than 100 rounds of artillery into the Sea of Japan, the Democratic People's Republic of Korea (DPRK) fired another missile into the waterway.

Iran PressAsia: South Korea's Joint Chiefs of Staff announced on Thursday morning that the launch of an "unknown ballistic missile" into the Sea of Japan had been detected.

According to Seoul, the missile was likely an intermediate-range or intercontinental-range ballistic missile, because the separation of rocket stages was detected.

An alert was sounded in Japan in the provinces of Miyagi, Yamagata, and Niigata, in north-central Honshu, for residents to seek shelter due to the launch. According to the Japanese government, the missile passed over Japan and landed in the Pacific Ocean.

This would be the fourth time that the DPRK has fired a ballistic missile over Japan, but the first time one has flown over the main island of Honshu. The first two times were in 2017, and the third just last month; all flew over the northern island of Hokkaido.

The launch comes a day after the DPRK fired a barrage of 17 missiles and more than 100 rounds of artillery into the Sea of Japan - the most of any such bombardment.

Since the US and South Korea began major military drills in August, which rehearsed strikes on North Korea, the DPRK has staged an unprecedented number of missile tests and artillery firing drills, including a variety of different weapons.

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