North Korea has failed to launch a missile, just hours after showcasing long-range ballistic weapons at a parade in the country's capital Pyongyang.
The launch attempt was made on North Korea's east coast, officials said. The missile exploded seconds after it launched, the US confirmed.
The South Korean defence ministry said: "North Korea attempted to test an unidentified type of missile from [the port of] Sinpo."
The officials added that they were carrying out further investigations of the incident. North Korea has now carried out five nuclear tests in total.
The attack comes after North Korea's leadership warned the US it was "ready to hit back with nuclear attacks" if provoked.
If the United States wages reckless provocation against us, our revolutionary power will instantly counter with annihilating strike, and we will respond to full-out war with full-out war and to nuclear war with our style of nuclear strike warfare.
US Vice-President Mike Pence is in the region, and has just landed in the South Korean capital, Seoul, where he will meet US troops and the South Korean leadership to discuss how the international community should respond to North Korean aggression.
The US has said it will no longer continue its policy of "strategic patience" with North Korea over its missile and nuclear programmes.