North Korea has reportedly fired what appeared to be a submarine-launched ballistic missile, according to South Korea.
The South's office of the Joint Chiefs of Staff said the missile had been fired off the North's east coast at around 6.30pm local time (10.30am BST).
It comes amid fears that the North may conduct further nuclear tests ahead of a rare meeting of its ruling Workers' Party in May - the first such congress in 36 years.
South Korea's Yonhap news agency said the missile flew "for a few minutes", but had no further details.
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