North Korea launched two short-range missiles into its East Sea early on Tuesday, Aug. 5, the fourth time within two weeks, amid an ongoing joint military drill between South Korea and the United States.

South Korea’s Joint Chiefs of Staff said one missile was fired at 5:24 a.m. and the other at 5:36 a.m. (local time) from North Korean province of South Hwanghae, Seoul-based Yonhap News reported.

Both projectiles flew around about 279 miles across the peninsula, at maximum altitude of about 22 miles, before splashing into the East Sea.

In a statement, the Joint Chiefs said South Korean and U.S. intelligence authorities are conducting analyses to determine what type of projectiles North Korea tested, but believed the short-range missiles bear similar flight features to those fired on July 25.

“Our military is monitoring the situation in case of additional launches and maintaining a readiness posture,” the Joint Chiefs said.

This short-range missile test marks the fourth such launch in less than two weeks, but the latest round on Tuesday comes a day after South Korea and the United States began their joint military exercise as scheduled.

North Korea’s rocket launch during a news program at the Seoul Railway Station in Seoul on Aug. 1, 2019. North Korea said leader Kim Jong Un supervised the first test firing of a new multiple rocket launcher system. (Ahn Young-joon/AP Photo)

After a projectile launch last week, North Korea said it was testing a new rocket artillery system.

At that time, President Trump also downplayed North Korea’s missile tests, saying it did not violate an earlier denuclearization agreement.

“Kim Jong Un and North Korea tested 3 short range missiles over the last number of days. These missiles tests are not a violation of our signed Singapore agreement, nor was there discussion of short range missiles when we shook hands,” President Trump said in a tweet on Aug. 2.

However, U.N. Security Council resolutions ban North Korea from launching ballistic missiles of any kind.