South Korean military officials say that North Korea appears to have launched two cruise missiles on Tuesday morning.
They said the missiles were fired from an "inland area" and that assessments are being carried out to verify the details.
The officials declined to say which direction the missiles were fired, only that it was not toward the East Sea.
They also said that because of the Earth's curvature, it's hard to detect when North Korea launches missiles from an inland area, and that they fly at lower altitudes and at lower speeds.
But the officials did say that if such missiles were to be fired toward the South, Seoul has the capability to detect and intercept them, no matter what altitude they travel at.
This is the fifth time this month that the regime has conducted some kind of missile test, after launching what it claimed were "hypersonic" missiles and short-range ballistic missiles.
Ballistic missiles ( 1)arch upwards before descending to reach their target, ( 2)whereas cruise missiles remain within the atmosphere while flying.
Also, ballistic missiles are powered by rockets on their way up, and can carry nuclear or conventional warheads.
But cruise missiles are powered by jet engines throughout their full journey, and can fly as low as a few meters off the ground which makes them harder to detect.
Seoul's Joint Chiefs of Staff always reports right away when the North launches a ballistic missile, but does not officially report on the regime's cruise missile launches.
Cruise missiles usually generate less interest, because unlike ballistic missiles, they are not banned under UN sanctions imposed on Pyeongyang.
Bae Eun-ji, Arirang News.