
The South Korean and U.S. militaries were analysing details of the launch, the South’s Office of the Joint Chiefs of Staff said.
The missile has flown over Japan, Japan’s NHK television said.
South Korea’s presidential Blue House has called an urgent National Security Council meeting.
Read More: U.S. Nuclear Commander Says Assuming North Korea Tested Hydrogen Bomb
The North’s launch comes a day after the North threatened to sink Japan and reduce the United States to “ashes and darkness” for supporting a U.N. Security Council resolution imposing new sanctions against it for its Sept. 3 nuclear test.