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.

Hokkaido