Seoul, South Korea (CNN) North Korea fired at least three unidentified projectiles Monday, according to US and South Korean officials, the second such move by the Kim Jong Un regime in two weeks.

South Korea's Defense Ministry said it detected different types of short-range projectiles fired from the Sondok area on North Korea's east coast into the waters between the Korean Peninsula and Japan. The projectiles had a maximum flight distance of 200 kilometers (124 miles) and maximum altitude of 50 kilometers (31 miles), according to the ministry.

"Currently, our military is monitoring related movement in case of an additional launch, while maintaining thorough preparedness," South Korea's Defense Ministry said Monday, adding that it believed the launches violated agreements reached with Pyongyang in 2018 intended to ease military tensions on the Korean Peninsula.

A US official told CNN that North Korea had fired four unidentified projectiles.

The South Korean Defense Ministry said the launches could be "joint strike drills that include multiple types of multiple rocket launchers" as part of Pyongyang's winter military drills.

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