A North Korean fired a missile over Japan on Tuesday, CNN reports.
Japanese Prime Minister Shinzo Abe called it as a "most serious and grave" threat.
The missile was fired just before 6 a.m. in Japan. The launch set off warnings in the northern part of the country urging people to seek shelter.
The unidentified missile flew over Erimomisaki, on the northern island of Hokkaido, and broke into three pieces before falling into the Pacific Ocean, about 1,180 kilometers (733 miles) off the Japanese coast.