Via NHK, says people should immediately seek shelter.
- says target appears to be Hokkaido area
- the Japanese government is warning people to seek shelter immediately in Hokkaido
Hokkaido is Japan's northernmost prefecture and second-largest island
South Korea media (Yonhap_ also saying the North has launched a ballistic missile, report it is heading towards the East Sea
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The warning issued by Japanese authorities is rare. There have been North Korean ballistic missiles launched towards the island, all (so far) have overflown into the Pacific.