Seoul, May 26 -- North Korea on Tuesday allgedly fired at least one unidentified projectile toward the Yellow Sea, according to the South Korean news agency Yonhap, citing the country's military.

According to the news agency, the S. Korean Joint Chiefs of Staff (JCS) said it was analysing details of the launch. Further details are awaited.

Earlier, in April, North Korea confirmed that it had successfully test-fired upgraded tactical ballistic missiles equipped with cluster warheads, an exercise personally overseen by leader Kim Jong Un.

According to a Kyodo News report citing the official Korean Central News Agency (KCNA), a total of five "Hwasongpho-11 Ra surface-to-surface tactical ballistic missiles struck the target area about 136 ...