The Joint Chiefs of Staff(JCS) said that North Korea fired one unidentified projectile into the East Sea on Tuesday morning.

The JCS said the North fired the projectile from an inland area eastward at around 6:40 a.m. 

It added that intelligence authorities of South Korea and the United States are analyzing the launch. 

The JCS said the South Korean military is closely monitoring the situation while maintaining close cooperation with the U.S. as well as a readiness posture. 

The launch comes 13 days after the North test-fired two short-range ballistic missiles into the East Sea from a train.

According to Japan's state broadcaster NHK, the Japanese government said the North fired what appeared to be a ballistic missile. The JCS did not specify that the projectile is a ballistic missile.