The launch comes amid a rise in tension on the Korean peninsula.
South Korea’s military has said that North Korea fired multiple unidentified cruise missiles on Tuesday into the sea off its west coast, making it the third time Pyongyang has tested cruise missiles in less than a week.
The Joint Chiefs of Staff said in a statement that the missiles were launched at around 7 a.m. (2200 GMT) on Monday.
“South Korean and U.S. intelligence authorities were closely monitoring the situation and analyzing the details of the launch” it said.
The launch comes amid a rise in tension on the Korean peninsula and follows a barrage of cruise missiles fired by Pyongyang off its east coast on Sunday.
Sunday’s launch was a test of the new submarine-launched cruise missiles (SLCM) dubbed “Pulhwasal-3-31” and leader Kim Jong Un supervised the test, North Korean state media KCNA reported on Monday.