North Korea has reportedly test-fired three medium-range Rodong ballistic missiles from Hwangju, a town in the Western part of the country, towards Japan.
The latest missile test fire follows the recent launch of a KN-11 ballistic missile from a submarine.
South Korea's Joint Chiefs Of Staff (JCS) have said that the missiles flew more 1,000km after being launched from North Hwanghae province on Monday.
At least one of the three missiles fell into Japan's Air Defence Identification Zone, Reuters reported citing a South Korean military official.
The US strongly condemned North Korea’s launch of three ballistic missiles into the sea of Japan, which threaten civil aviation and maritime commerce in the region.
These launches violate multiple UN Security Council Resolutions that prohibit North Korea's launches using ballistic missile technology.
US Department of State spokesperson John Kirby said: “We will raise our concerns at the UN about the threat posed to international security by these programmes.
"We will also do so in other fora—including the upcoming East Asia Summit—to bolster international resolve to hold the Democratic People's Republic of Korea accountable for its provocative actions. Our commitment to the defense of our allies in the face of these threats remains ironclad.
“We call on North Korea to refrain from actions and rhetoric that further raise tensions in the region and to focus instead on taking concrete steps toward fulfilling its international obligations and commitments.”
North Korea’s nuclear and ballistic missile programmes threatens the US and its allies Japan and the Republic of Korea.