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North Korea has attempted to fire a ballistic missile off its east coast but the launch appears to have failed, South Korean military officials say.
It is unclear what type of missile it was, but it follows three failed tests of the medium-range "Musudan" missile in April.
The North is banned by the UN from using any ballistic missile technology.
Tensions have run high in the region after Pyongyang's fourth nuclear test in January and numerous missile tests.
South Korea's Joint Chiefs of Staff said the attempted launch happened at 05:20 local time (20:50 GMT Monday) off the North's east coast, near the city of Wonson.
A report in the Yonhap news agency quoted sources saying this fourth failed test may also have been of a Musudan missile.
A Musudan missile, in theory, has the range to reach Japan and the US territory of Guam, however the North has never successfully tested one.
The increased weapons activity started in the lead up to the North's first congress of the ruling Worker's Party in 36 years earlier this month.
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Media captionWhat we learned from the North Korea party congress During the congress, North Korea's leader Kim Jong-un extended an offer of military dialogue to the South. But Seoul dismissed the proposal as insincere.
At the same meeting, Mr Kim also vowed to continue with the nuclear weapons programme.
Pyongyang has claimed a series of technical breakthroughs in recent months, including miniaturising a nuclear warhead to fit on a missile, that experts have treated with scepticism.
North Korea's rocket launches
Image copyright KCNA
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It is unclear what type of missile it was, but it follows three failed tests of the medium-range "Musudan" missile in April.
The North is banned by the UN from using any ballistic missile technology.
Tensions have run high in the region after Pyongyang's fourth nuclear test in January and numerous missile tests.
South Korea's Joint Chiefs of Staff said the attempted launch happened at 05:20 local time (20:50 GMT Monday) off the North's east coast, near the city of Wonson.
A report in the Yonhap news agency quoted sources saying this fourth failed test may also have been of a Musudan missile.
A Musudan missile, in theory, has the range to reach Japan and the US territory of Guam, however the North has never successfully tested one.
- North Korea's missile programme
- Is South Korea equipped to defend itself?
- A world leader in dramatic rhetoric
- How potent are the threats?
The increased weapons activity started in the lead up to the North's first congress of the ruling Worker's Party in 36 years earlier this month.
Jump media player
Media player help
Out of media player. Press enter to return or tab to continue.
Media captionWhat we learned from the North Korea party congress During the congress, North Korea's leader Kim Jong-un extended an offer of military dialogue to the South. But Seoul dismissed the proposal as insincere.
At the same meeting, Mr Kim also vowed to continue with the nuclear weapons programme.
Pyongyang has claimed a series of technical breakthroughs in recent months, including miniaturising a nuclear warhead to fit on a missile, that experts have treated with scepticism.
North Korea's rocket launches
Image copyright KCNA
- February 2016: Launch of rocket reportedly carrying satellite
- May 2015: North Korea announces it has successfully tested a submarine-launched missile for the first time, but scepticism is then poured on the claim
- Dec 2012: North Korea launches three-stage rocket, says it successfully put a satellite into orbit; US defence officials confirm object in orbit
- Apr 2012: Three-stage rocket explodes just after take-off, falls into sea
- Apr 2009: Three-stage rocket launched; North Korea says it was a success, US says it failed and fell into the sea
- Jul 2006: North Korea test-fires a long-range Taepodong-2 missile; US said it failed shortly after take-off
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