SEOUL, July 30 -- The Democratic People's Republic of Korea (DPRK) fired four short-range projectiles, which were estimated to be launched from 300-milimeter multiple-rocket launchers, Yonhap News Agency said Wednesday citing officials from the Joint Chiefs of Staff (JCS).

The DPRK fired two short-range projectiles at 7:30 a.m. and 7: 40 a.m. each from Mount Myohyang in the DPRK's Pyongan Province in the easterly direction, according to the JCS officials.

The officials said the launches seemed to fail as the projectiles flew for just several seconds.

Pyongyang launched two more short-range projectiles, which flew around 210 km and 130 km each, at 5:50 p.m. and 6 p.m. respectively from the same region into the easterly direction.

The projectile with a range of 210 km was believed to land in eastern waters, and the other reportedly fell in the DPRK's territory.

The South Korean military estimated those projectiles might be 300-millimeter multiple-rocket launchers termed by South Korea as KN-09 with a range of 150-160 km.

It was the first time that those projectiles from the KN-09 reportedly flew more than 200 km.