Reports from South Korean and Japanese governments say North Korea has fired a missile eastwards from its capital, Pyongyang, towards Japan.
South Korea’s military said the missile is likely to have reached an altitude of over 750 kilometres and travelled some 3 700 kilometres.
Last month, North Korea fired a missile over Japan in what Tokyo said was an unprecedented threat to the country.
The missile launch comes just days after new sanctions were imposed on North Korea by the United Nations because of its weapons testing.
South Korea’s presidential palace has called an urgent national Security Council meeting.