South Korea's Joint Chiefs of Staff
The JCS said that the projectiles, fired at 4:35 p.m.
The projectiles were reportedly detected by an Aegis-equipped South Korean destroyer and a land-based missile radar.
North Korean state media said on Friday that the North’s Academy of Defense Science had carried out successful tests of "super-large" multiple rocket launchers the previous day.
State media reports said that the tests verified that the "continuous fire system" of the launchers is able to "totally destroy" a group target of the enemy by a surprise strike and verified the "perfection" of the weapons system.
The reports added North Korean leader Kim Jong-un "expressed satisfaction" over the test. Kim was likely not personally present at the launches.
The provocations came just a day after North Korean leader Kim Jong-un sent a condolence letter to President Moon Jae-in following the death of his mother earlier in the week.
The JCS said that the military is monitoring the situation in case of additional launches and maintaining a readiness posture, calling on the North to immediately cease such provocations as they do not help efforts to ease tensions on the Korean Peninsula.