North Korea fired a short-range missile from its east coast on Sunday, a day after launching three of these missiles, a South Korean news agency said, ignoring calls for restraint from Western powers.
“North Korea fired a short-range missile as it did yesterday into its east sea in the afternoon,” South Korea's news agency Yonhap reported, citing a military official.
A South Korean defence ministry official confirmed the Yonhap report, but did not provide any details.
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Tension on the Korean peninsula has subsided in the past month, having run high for several weeks after the United Nations Security Council imposed tougher sanctions against Pyongyang following its third nuclear test in February.
The North had for weeks issued nearly daily warnings of impending nuclear war with the South and the US.
South Korea's Unification Ministry criticised the missile tests as deplorable and urged the North to lower tensions and hold talks over a suspended inter-Korean industrial park in the North's border city of Gaeseong.
South Korea pulled out all of its workers from the industrial zone early this month after North Korea withdrew its 53,000 workers as tensions mounted.