North Korea has reportedly test-fired three short-range, anti-ship missiles into the sea from a site near the eastern city of Wonsan, the latest development after the underwater test of a ballistic missile in May.
A South Korea's defence ministry spokesman reported that North Korea fired three KN-01 missiles during the recent test.
The ministry spokesman said: "The missiles appear to have a range of nearly 100km (62 miles).
"We are closely monitoring the movements of the North's military, and maintaining full readiness against potential provocations."
The ministry official added that the test lasted for nearly 26 minutes.
A Korean Central News Agency official claimed that the missiles accurately detected and hit their targets during the test, which was reportedly witnessed by North Korean leader Kim Jong-un.
Meanwhile, the North Korean move follows a recent test-fire of two ballistic missiles by South Korea. Earlier this month, the country tested missiles that are said to be capable of hitting any part of North Korea.
Prior to the ballistic missile test in May, North Korea reportedly conducted the third test of a new submarine-launched ballistic missile (SLBM) from an underwater test platform near the country's coastal city of Sinpo.
Previous tests of the KN-11 missile were conducted in January and October 2014. The first test was carried out onboard a sea-based platform, while the second test was launched from a land-based static platform.