The first of the three missiles launched by North Korea on Wednesday is suspected to be an intercontinental ballistic missile (ICBM), South Korea's military said.

The suspected ICBM traveled 360 kilometers (224 miles) at a maximum altitude of 540 km, the Joint Chiefs of Staff (JCS) said.

These calculations are similar to those of the Japanese military authorities, which also detected the launches.

The first of the launch took place around 6 am local time (21:00 GMT Tuesday) and the other two at 6.37 am and 6.42 am, according to the JCS, adding they all took place from Sunan area of Pyongyang.