SEOUL North Korea attempted to launch an intermediate range ballistic missile off the country's east coast on Friday but the launch failed, South Korea's Yonhap News Agency reported.
The failed launch follows North Korea's fourth nuclear test in January and a long-range rocket launch the next month, which led to fresh U.N. sanctions.
Yonhap said the failed launch appeared to be a Musudan missile with a range of more than 3,000 kms (1,800 miles).
An official at the South Korean defence ministry said North Korea was attempting a missile launch early on Friday morning but the launch appeared to have failed, however, the official could not confirm the type of the missile.
The United States, which has 28,000 troops stationed in South Korea, said on Thursday it was aware of reports that North Korea was preparing to test intermediate-range missiles and was closely monitoring the Korean Peninsula.
Friday is the anniversary of North Korean founding president Kim Il Sung's birthday, April 15, and is widely celebrated in the isolated country. In 2012, the day was marked by a long range rocket launch attempt, which also failed.
On Thursday, North Korea deployed one or two Musudan ballistic missiles on its east coast in apparent preparation for the launch, South Korea's Yonhap news agency reported, citing multiple South Korean government sources.
The Musudan missile, with a design range of more than 3,000 km (1,800 miles), is not known to have been flight-tested, according to South Korean defence ministry and experts.
Some experts have said North Korea may choose to test-fire the Musudan in the near future as it tries to build an intercontinental ballistic missile designed to put the mainland United States within range.
North Korea, which regularly threatens to destroy South Korea and the United States, often fires missiles during periods of tension in the region or when it comes under pressure to curb its defiance and abandon its weapons programmes.
(Reporting by Ju-min Park; Writing by James Pearson; Editing by Michael Perry)
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Updated Date: Apr 15, 2016 06:15:11 IST