North Korea fired off four short-range rockets in an eastern direction on Wednesday, South Korea's Joint Chiefs of Staff (JCS) said, in the second such test-fire in less than a week.

The projectiles, presumed to be 300-millimeter multiple-launch rockets, "were fired from a site near Mount Myohyang in Pyongan Province at 7:30 a.m., 7:40 a.m., 5:50 p.m. and around 6 p.m. today," the JCS said in a statement.

"The two projectiles launched in the morning flew for just a few seconds. It appears that the North's firing failed," it noted.

The third rocket flew 210 kilometers and was presumed to have landed in the East Sea, while the last one flew 130 kilometers and may have fallen in an inland area, according to the JCS.

"Our military has maintained vigilance against additional launches and is taking necessary steps," the JCS said. (Yonhap)