North Korea launched what appeared to be several land-to-ship-missiles off its east coast on Thursday local time, Reuters reported.
In a statement, South Korea's Office of Joint Chiefs of Staff said, "North Korea fired multiple unidentified projectiles, assumed to be surface-to-ship missiles, this morning from the vicinity of Wonsan, Gangwon Province."
The launches come less than a week after the United Nations Security Council instated sanctions against the repressive regime, which said it would continue to pursue its nuclear and weapons program.
Newly-elected South Korean President Moon-Jae-in has been briefed on the launch, the military added.
Thursday's launch is the fourth test conducted at the hands of North Korea since Moon had taken office on May 10 vowing to engage in dialogue with Pyongyang.