North Korea has tested a new weapon under the supervision of its leader with “mysterious and amazing” success, state news agency KCNA reported Saturday.

In an article about the Friday launch, in which Kim Jong-un praised the work of scientists for the rapid development of the weapon, the leader was reported as saying that his goal is to "possess invincible military capabilities no one dare provoke and to keep bolstering them."

No details about the weapon were given.

Kim said "our reliable scientists in the field of the national defense science developed in the shortest span of time the major military striking means the Party planned recently and showed the mysterious and amazing success rates," said the article.

"(Kim) said everyone should remember that it is the Party's core plan and fixed will for defense building to possess such a powerful force strong enough to discourage any forces from daring to provoke us and to leave all others vulnerable to our Juche weapons," KCNA added.

The report was released a day after North Korea launched two new short-range projectiles from the country's eastern coast.

The shells were fired early Friday from Kangwon Province, reaching a maximum height of 30 kilometers and traveling about 230km before falling into the Sea of Japan, according to the South Korean Joint Chiefs of Staff.

Experts have pointed out that the projectiles have external similarities to the ATACM, a US surface-to-surface missile system, according to South Korean news agency Yonhap.

Friday’s launch was the sixth since July 25, a series apparently made in protest at the joint military maneuvers between Seoul and Washington, which Pyongyang considers a threat.

North Korea has criticized Seoul in particular for continuing the exercises while also talking about peace on the peninsula and cross-border cooperation, and has rejected further dialog with the South. EFE-EPA