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On the same day when North Korea launched a long-range rocket on Feb. 7, South Korean Navy retrieved parts believed to be its debris from the far southern part of Korean peninsula, NBC News has learnt.

An object that the South Korean Defense Ministry believes to be a part of a North Korean rocket is displayed on a South Korean navy ship on Tuesday, Feb. 9, 2016, in undisclosed location, South Korea. South Korean Defense Ministry via AP

North Korean state media said Pyongyang has "totally succeeded in launching the fourth Kwangmyongsong satellite," but the launch was widely seen as a cover for testing ballistic missile technology.

A metal object believed to be a part of North Korean long range rocket launched on February 7, 2016. Handout / Reuters

Meanwhile, South Korean Navy is still analyzing the debris, trying to confirm if the so-called satellite is actually a ballistic missile.