
IMAGE SOURCE, GETTY IMAGES Image caption, File photo of a previous North Korea ballistic rocket launch
The suspected missile was fired from an airfield outside the capital Pyongyang.
The airfield has been the site of several launches, including previous tests of what were the US alleges were intercontinental ballistic missiles (ICBMs).
It comes as North Korea has in recent weeks stepped up its weapons testing.
“North Korea fired an unknown projectile from the Sunan area around 09:30 today, but it is presumed that it failed immediately after launch,” Seoul’s Joint Chiefs of Staff said in a statement.
Specialist news site NK News cited witnesses as saying they heard, loud “blowing” sounds – similar to that of a large aircraft were audible in Pyongyang, followed by a loud “crash”. It added that it had seen an image showing a red-tinted ball of smoke in the sky above the capital.
With a minimum range of 5,500km (3,417 miles), ICBMs can reach the US. They are designed for nuclear arms delivery.
The UN prohibits North Korea from ballistic and nuclear weapons tests, and has imposed strict sanctions.
The North had put a moratorium in place on testing long-range ballistic missiles and nuclear tests after talks with then US President Donald Trump. But in 2020, Mr Kim announced he was no longer bound by this promise.
Pyongyang has however, maintained that the launches on 26 February and 4 March were focused on developing a reconnaissance satellite.

Each launch does help scientists learn what works and what doesn’t. But this is a big year for Kim Jong Un. It’s his 10th year in charge, he will want success not failure.
Also as one expert pointed out – at what point did this launch fail?
It was launched at the country’s main airport, Sunan. Any major explosion near the ground could damage the airport.
And any explosion further up could risk debris falling on populated areas. We will know more after further analysis by US and South Korean defence ministries.
Either way, it is unlikely this failure will deter North Korea. Kim Jong Un has a wish list of weapons – he will press ahead.
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