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N Korea 'fires missile from submarine' North Korea 'fires missile from submarine'
(35 minutes later)
North Korea fires submarine-based ballistic missile, South Korea's Yonhap news agency reports North Korea has fired a submarine-based ballistic missile, South Korea's Yonhap news agency says.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. The reported test follows an attempted launch last month that South Korea said failed in its initial flight stage.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. North Korea, believed to be developing nuclear weapons, is banned by the UN from any use of ballistic missiles.
The latest launch comes after Pyongyang threatened retaliation for joint US-South Korea military exercises that it sees as a rehearsal for invasion.
Last month, the US and South Korea also agreed to deploy a missile defence system to counter threats from the North.
In January, North Korea conducted its fourth nuclear test, claiming it to be its first using a hydrogen bomb.
Shortly after that Pyongyang launched a satellite, widely seen as a test of long-range missile technology.