North Korea has tested another ballistic missile, according to the South Korean military. It was fired east, over the Sea of Japan, and was the 18th robot test this year.
It is unclear what type of ballistic robot it is. Last week, North Korea fired a suspected intercontinental ballistic missile (ICBM), which experts say could reach the United States.
The United States and South Korea have been warning for several weeks that North Korea may be about to conduct a nuclear test.