South Korea's Joint Chiefs of Staff said North Korea on Thursday fired two short-range missiles into the East Sea from the North's eastern town of Hamju.
The missiles were launched consecutively some 19 minutes apart.
They flew about 450 kilometers and reached an altitude of some 60 kilometers.
"The South Korean military identified two short-range missiles fired from North Korea's Hamju at around 7:06AM and 7:25AM on Thursday. The military is maintaining its readiness posture while closely monitoring related moves."
The Joint Chiefs did not deny or confirm whether they're ballistic missiles but said it's considering the possibility that they could be ballistic missiles.
If it's confirmed that the missiles are ballistic, it means the North has violated UN Security Council resolutions for the first time since U.S. President Joe Biden took office.
The last time North Korea had fired ballistic missiles was a year ago.
South Korean military sources say the recent missiles had been fired using transporter erector launchers which make them harder to detect and intercept since they can be launched from anywhere instead of just from launch sites.
Sources also say there's a possibility that North Korean leader Kim Jong-un was present for the latest test-fire.
Observers say the launches signify that the North is ready to gradually raise tensions with the U.S. and its provocative acts could be further exacerbated by Washington's nonchalant response.
On Sunday, the regime fired two cruise missiles into the West Sea but the U.S. shrugged those off as "business as usual" with President Biden saying "nothing much had changed."
Kim Ji-yeon, Arirang News.