A North Korean multiple rocket launcher test-fires in this footage released by the Korea Central News Agency on Oct. 31, 2019. Yonhap

North Korea fired two projectiles from what is presumed to be a super-large multiple rocket launcher on Thursday, South Korea's military said, in the latest in a series of military moves amid stalled denuclearization talks with the United States.

The projectiles were fired from Yeonpo in the country's eastern South Hamgyong Province into the waters off the east coast at around 4:59 p.m., the Joint Chiefs of Staff (JCS) said in a release.

Both flew around 380 km, reaching a maximum altitude of around 97 km, and were fired within a 30-second interval, the JCS added.

"South Korean and U.S. intelligence authorities are analyzing additional features," the JCS said. "Our military is monitoring the situation in case of additional launches and maintaining a readiness posture."