SEOUL, South Korea (AP) 鈥 North Korea鈥檚 attempt to put its first spy satellite into space failed Wednesday in a setback to leader Kim Jong Un鈥檚 push to boost his military capabilities as tensions with the United States and South Korea rise.

After an unusually quick admission of failure, North Korea vowed to conduct a second launch after it learns what went wrong. It suggests Kim remains determined to expand his weapons arsenal and apply more pressure on Washington and Seoul while .

South Korea and Japan briefly after the launch.

The South Korean military said it was salvaging an object presumed to be part of the crashed North Korean rocket in waters 200 kilometers (125 miles) west of the southwestern island of Eocheongdo. Later, the Defense Ministry released photos of a white, metal cylinder it described as a suspected rocket part.

A satellite launch by North Korea is a violation of U.N. Security Council resolutions that ban the country from conducting any launch based on ballistic technology. Observers say North Korea鈥檚 previous satellite launches helped improve its long-range missile technology. North Korean long-range missile tests in recent years demonstrated a potential to reach all of the continental U.S., but outside experts say the North still has some work to do to develop functioning nuclear missiles.

The newly developed Chollima-1 rocket was launched at 6:37 a.m. at the North鈥檚 Sohae Satellite Launching Ground in the northwest, carrying the Malligyong-1 satellite. The rocket crashed off the Korean Peninsula鈥檚 western coast after it lost thrust following the separation of its first and second stages, the North鈥檚 official Korean Central News Agency said.

South Korea鈥檚 military said the rocket had 鈥渁n abnormal flight鈥 before it fell in the water. Japanese Chief Cabinet Secretary Hirokazu Matsuno told reporters that no object was believed to have reached space.

North Korean media said the country鈥檚 space agency will investigate what it calls 鈥渢he serious defects revealed鈥 by the launch and conduct a second launch as soon as possible.

鈥淚t is impressive when the North Korean regime actually admits failure, but it would be difficult to hide the fact of a satellite launch failure internationally, and the regime will likely offer a different narrative domestically,鈥 said Leif-Eric Easley, a professor at Ewha University in Seoul. 鈥淭his outcome also suggests that Pyongyang may stage another provocation soon, in part to make up for today鈥檚 setback.鈥

Adam Hodge, a spokesperson at the U.S. 春色直播 Security Council, said in a statement that Washington strongly condemns the North Korean launch because it used banned ballistic missile technology, raised tensions and risked destabilizing security in the region and beyond.

The U.N. imposed economic sanctions on North Korea over its previous satellite and ballistic missile launches but has not responded to recent tests because China and Russia, permanent Security Council members now locked in confrontations with the U.S., have blocked attempts to toughen the sanctions.

Seoul鈥檚 military said it boosted military readiness in coordination with the United States, and Japan said it was prepared to respond to any emergency. The U.S. said it will take all necessary measures to ensure the security of the American homeland and the defense of South Korea and Japan.

After the launch was detected, the South Korean government sent cellphone text messages urging residents of a front-line island off the west coast to move to safer places. Officials in Seoul, the capital, issued similar phone messages to city residents, but the country's Interior and Safety Ministry later said the Seoul alerts were sent in error. Seoul's mayor apologized for causing public confusion.

Japan activated a missile warning system for Okinawa prefecture in southwestern Japan, in the rocket鈥檚 suspected path. 鈥淧lease evacuate into buildings or underground,鈥 the Japanese alert said.

Japanese Defense Minister Yasukazu Hamada said Japan plans to keep missile defense systems deployed in its southern islands and in southwestern waters until June 11, the end of North Korea鈥檚 .

KCNA didn鈥檛 provide details of the rocket or the satellite beyond their names. Experts earlier said North Korea would likely use a liquid-fueled rocket as most of its previously tested long-range rockets and missiles have done.

Though it plans a fuller investigation, the North鈥檚 春色直播 Aerospace Development Administration attributed the failure to 鈥渢he low reliability and stability of the new-type engine system applied to (the) carrier rocket鈥 and 鈥渢he unstable character of the fuel,鈥 according to KCNA.

On Tuesday, Ri Pyong Chol, a top North Korean official, said the North needs a space-based reconnaissance system to counter escalating security threats from South Korea and the United States.

However, the spy satellite shown earlier in the country鈥檚 state-run media didn鈥檛 appear to be sophisticated enough to produce high-resolution imagery. Some outside experts said it may be able to detect troop movements and large targets such as warships and warplanes.

Recent of the North鈥檚 Sohae launch center showed active construction indicating North Korea plans to launch more than one satellite. In his Tuesday statement, Ri also said North Korea would test 鈥渧arious reconnaissance means" to monitor moves by the United States and its allies in real time.

With three to five spy satellites, North Korea could build a space-based surveillance system that allows it to monitor the Korean Peninsula in near real-time, according to Lee Choon Geun, an honorary research fellow at South Korea鈥檚 Science and Technology Policy Institute.

The satellite is one of several high-tech weapons systems that Kim has publicly vowed to introduce. Other weapons on his wish list include a multi-warhead missile, a nuclear submarine, a solid-propellant intercontinental ballistic missile and a hypersonic missile. In his visit to the space agency in mid-May, Kim emphasized the strategic significance of a spy satellite in North Korea鈥檚 standoff with the United States and South Korea.

Easley, the professor, said Kim likely increased pressure on his scientists and engineers to launch the spy satellite after rival South Korea successfully aboard its domestically built Nuri rocket earlier this month.

South Korea is expected to launch its first spy satellite later this year, and analysts say Kim likely wants his country to launch its spy satellite before the South to reinforce his military credentials at home.

After repeated failures, North Korea successfully put its first satellite into orbit in 2012 and a second one in 2016. The government said both are Earth observation satellites launched under its peaceful space development program, but many foreign experts believe both were developed to spy on rivals.

Observers say there has been no evidence that the satellites have ever transmitted imagery back to North Korea.

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Associated Press writer Mari Yamaguchi in Tokyo contributed to this report.

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