North Korea has fired an an intercontinental ballistic missile which may have landed in Japan's exclusive economic zone (EEZ), according to the country's Prime Minister Shinzo Abe.
The zone reaches 200 nautical miles from the country's coast. Mr Abe has called an emergency meeting of the National Security Council.
"I have received information that North Korea once again conducted a missile firing," Mr Abe said. "We will immediately analyze information and do our utmost to protect the safety of the Japanese people."
He called on the US, South Korea, Russia and China to increase pressure on the secretive state over its missile launches, which have defied international rulings.
Trump on North Korea: There are consequences for their bad behaviour
Chief Cabinet Secretary Yoshihide Suga said Japan "absolutely cannot tolerate" repeated provocations from North Korea, also known as the DPRK.
Soon after reports of the launch emerged from Japan, the Pentagon and South Korean military officials confirmed they detected a ballistic missile launch from North Korea.
On Friday evening, Pentagon spokesman Captain Jeff Davis said: "The US Department of Defence detected and tracked a single North Korea missile launch today. We assess that this missile was an intercontinental ballistic missile, as had been expected.
"The missile was launched from Mupyong-ni and travelled about 1,000km before splashing down in the Sea of Japan. We are working with our interagency partners on a more detailed assessment.
"The North American Aerospace Defence Command (NORAD) determined the missile launch from North Korea did not pose a threat to North America.
"Our commitment to the defence of our allies, including the Republic of Korea and Japan, in the face of these threats, remains ironclad. We are prepared to defend ourselves and our allies from any attack or provocation."
Arms control expert Jeffrey Lewis said the lengthy flight time meant the missile was likely a long-range intercontinental ballistic missile (ICBM), potentially capable of travelling 10,000km and hitting a target in the US.
According to Yonhap news agency, South Korean military officials said the missile was launched from Jagang Province, in the north of the DPRK.
South Korea has also called a national security meeting.
The night time launch of the ICBM was unusual, as most take place around dawn. Dr. John Nilsson-Wright, senior research fellow on Chatham House's Asia programme, told The Independent this could have been to demonstrate the military was capable of launching in varying conditions.
Alternatively, Dr Nilsson-Wright said, "maybe the element of surprise is part of the reason why they wanted to do this".
He added: "I think they've shown that they have the capability, the increased technical sophistication, and I think there will be a lot of anxiety in Seoul and Tokyo."
It comes just one day after the 64th anniversary of the end of the Korean War -- known as Victory Day in the North.
Intelligence officials in both the US and South Korea feared the DPRK could launch a missile to mark the event.
North Korea fired what was believed to be its first ICBM earlier this month.
North Korea, led by unpredictable ruler Kim Jong-un, has fired missiles into the EEZ several times before.
In pictures: North Korea military drill
8 show all In pictures: North Korea military drill
1/8 North Korea's leader Kim Jong Un watches a military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) KCNA/Handout via REUTERS
2/8 A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) is seen in this handout photo by North Korea's Korean Central News Agency (KCNA) KCNA/Handout via REUTERS
3/8 A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) is seen in this handout photo by North Korea's Korean Central News Agency (KCNA) KCNA/Handout via REUTERS
4/8 A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) KCNA/Handout via REUTERS
5/8 A military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) KCNA/Handout via REUTERS
6/8 This image made from video of still images broadcast in a news bulletin by North Korea's KRT, shows what was said to be a 'Combined Fire Demonstration' held to celebrate the 85th anniversary of the North Korean army, in Wonsan, North Korea. KRT via AP Video
7/8 This image made from video of still images broadcast in a news bulletin by North Korea's KRT, shows what was said to be a 'Combined Fire Demonstration' held to celebrate the 85th anniversary of the North Korean army, in Wonsan, North Korea. KRT via AP Video
8/8 This image made from video of still images broadcast in a news bulletin by North Korea's KRT, shows what was said to be a 'Combined Fire Demonstration' held to celebrate the 85th anniversary of the North Korean army, in Wonsan, North Korea. KRT via AP Video
International tensions have been mounting over the nuclear ambitions of North Korea in recent months, and Donald Trump has threatened to "take care" of the unstable situation.
Just yesterday, a senior US military official warned the DPRK’s weapons technology was improving faster than expected.
"North Korea is extremely dangerous and more dangerous as the weeks go by,” said General Mark Milley, chief of staff of the Army.
C4RB0NUN1T on July 28th, 2017 at 16:55 UTC »
It must be fun for the North Koreans to watch millions of dollars launched into the ocean one a month while they starve.
bdh008 on July 28th, 2017 at 16:33 UTC »
Experts are speculating on a 10000km range based on the flight, which now means New York City is in range. Obviously testing is different than real life, but the progress they are making is incredible for the period of time.
Aeogor on July 28th, 2017 at 16:05 UTC »
What do they want?