North Korea has fired an intermediate-range ballistic missile that flew over Japan before landing in the northern Pacific Ocean.
It was the second aggressive test-flight over the territory of the close US ally in less than a month and it followed the sixth and most powerful nuclear test by North Korea to date on September 3.
South Korea's Joint Chiefs of Staff said the missile travelled about 3,700 kilometers (2,300 miles) while reaching a maximum height of 770 kilometers (478 miles).
The missile, launched from Sunan, the site of Pyongyang's international airport, flew farther than any other missile North Korea has fired. The distance it flew is slightly greater than between the North Korean capital and the American air base in Guam.
It was "the furthest overground any of their ballistic missiles has ever travelled", Joseph Dempsey of the International Institute for Strategic Studies said on Twitter.
Physicist David Wright, of the Union of Concerned Scientists, added: "North Korea demonstrated that it could reach Guam with this missile, although the payload the missile was carrying is not known" and its accuracy was in doubt.
Sirens sounded and alerts were issued in Japan as residents were warned to take shelter while the missile passed over Hoakkaido.
"We can never tolerate that North Korea trampled on the international community's strong, united resolve toward peace that has been shown in UN resolutions and went ahead again with this outrageous act," Shinzo Abe, the Japanese prime minister, said.