North Korea has hailed as a success its latest test of an intercontinental ballistic missile (ICBM), describing it as a "stern warning" for the US.
North Korean leader Kim Jong-un said the test proved that the entire US was within striking range, state media reported.
However, experts say many of North Korea's missiles cannot accurately hit targets. The launch came three weeks after North Korea's first ICBM test.
The Pentagon said the latest missile was launched at 15:41 GMT from an arms plant in Jagang province in the north of the country.
It is unusual for North Korea to launch a missile at night - the significance is as yet unclear. This is the first missile fired from Jagang province, indicating a previously-unknown launch site is operational.
The test was condemned by the US and North Korea's neighbours.