North Korea has fired an “unidentified ballistic missile,” Pyongyang’s second such launch in a week.

Seoul’s Joint Chiefs of Staff (JCS) said “it detected the launch” but gave no further details, the Yonhap news agency cited Seoul’s military as saying.

Yonhap added that an analysis was underway. Tokyo also confirmed the launch, with the coastguard warning vessels to take care.

On Friday, North Korea released images of its uranium enrichment facility for the first time, showing leader Kim Jong-un touring a nuclear facility.

The state media reported on Friday that the North Korean leader called for increasing the number of centrifuges for uranium enrichment to increase the nation’s nuclear arsenal for self-defense.

The country, which conducted its first nuclear test in 2006, has never publicly disclosed details of its uranium enrichment facility.

Such facilities produce highly enriched uranium by spinning the original material in centrifuges at high speeds.

Kim toured the Nuclear Weapons Institute and the “production base of weapon-grade nuclear materials,” according to the Korean Central News Agency (KCNA).

The KCNA did not provide the facility’s location or visit date.

Pyongyang, which has been under harsh sanctions by the United States and the United Nations Security Council for years over its nuclear and ballistic missile programs, says such military maneuvers amount to a rehearsal for invasion.

Kim has repeatedly said that Pyongyang is strengthening its armed forces to confront the US and its regional allies in a war that could “break out at any time” on the Korean Peninsula.

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