South Korea's military says North Korea has fired four short-range projectiles into the sea.
Seoul's Joint Chiefs of Staff said in a statement that the projectiles with a range of 140 kilometres were fired on Friday into waters off North Korea's west coast.
North Korea regularly test-fires missiles, rockets and artillery.
It has conducted a series of weapons tests since South Korean and US troops began annual military drills last month.
North Korea has denounced the drills as a rehearsal for an invasion.
South Korea and the US say the drills are defensive in nature.
The training is set to end later this month.
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