Seoul (CNN) Two projectiles launched by North Korea on Thursday were "presumed to be fired from a super-large caliber multiple rocket launcher," South Korean army officials said.

"This North Korean action does not aid the easing of tension on the Korean Peninsula," said Army Major Gen. Jeong Dong-jin of the South Korean Joint Chief of Staff.

"We express a strong regret and again call for immediate suspension of actions that heightens tension," he added.

This undated and undisclosed picture released from North Korea's official Korean Central News Agency (KCNA) on Friday shows North Korean leader Kim Jong Un (center) inspecting the test-fire of the super-large multiple launch rocket system.

Jeong said the two short-range projectiles, fired at 4:59 p.m. local time, had a maximum flight distance of about 380 kilometers (236 miles) and an altitude of 97 kilometers (60 miles).

Japan's Prime Minister Shinzo Abe said his country had not confirmed that the missiles landed in Japan's marine zone, the area officially known as the Japanese Exclusive Economic Zone.