The Pentagon has confirmed Monday that North Korea fired a missile over Japan writing:

“We assess North Korea conducted a missile launch within the last 90 minutes. We can confirm that the missile launched by North Korea flew over Japan. We are still in the process of assessing this launch. North American Aerospace Defense Command (NORAD) determined the missile launch from North Korea did not pose a threat to North America. We are working closely with Pacific Command, Strategic Command and NORAD and will provide an update as soon as possible.”

A senior U.S. official says there has been some movement suggesting an intermediate missile was being prepped. The South Korean military says this particular missile went 1,700 miles into space. That altitude lower than the 2,300 miles an intercontinental ballistic missile went in late July.

According to Yonhap News Agency,South Korea’s Joint Chiefs of Staff (JCS) said a missile was fired from the area of Sunan in Pyongyang shortly before 6:00 A.M. and flew east, adding:

“It passed through the sky over Japan.”

Japan’s broadcaster NHK says the missile flew over the nation’s territory, with Japan’s Chief Cabinet Secretary Yoshihide Suga calling it an “unprecedented grave threat.”

South Korea’s presidential office Cheong Wa Dae convened a National Security Council (NSC) session quickly after the missile was fired.

This move came after North Korea fired 3-short-range missiles Saturday. The U.S. military reports all missiles were noted as successful, despite initial reports suggesting failure. Seoul’s Joint Chiefs of Staff reports the missiles were fired during the weekend from North Korea’s eastern coast flew about 155-miles.

U.S. and South Korean forces started military exercises last week that are done annually. North Korea calling this a rehearsal for war. Japan’s military has been practicing on how to deploy anti-missile batteries at three U.S. bases in Japan. The U.S. military says these drills test the ability of Japanese and U.S. forces to work together, but also this allows Japan to practice rapid deployment of its PAC-3 anti-missile system.

President Donald Trump claimed earlier this month North Korea would be met with “fire and fury like the world has never seen” if threats continued.

North Korea recently threatened to send missiles over western Japan and into waters near the U.S. territory of Guam, and has conducted a series of test launches to develop its missile capability.

This image made from video aired by North Korea's KRT on Saturday, Aug. 26, 2017, shows a photo of North Korean leader Kim Jong Un, second right, speaks with officials during what Korean Central News Agency called a "target-striking contest" at unknown location in North Korea. (KRT via AP Video)

This image made from video aired by North Korea’s KRT on Saturday, Aug. 26, 2017, shows a photo of North Korean leader Kim Jong Un, second right, speaks with officials during what Korean Central News Agency called a “target-striking contest” at unknown location in North Korea. (KRT via AP Video)

Fox News’ Jennifer Griffin, Lucas Tomlinson and The Associated Press contributed to this report.