People watch news of North Korea's missile launch on a television screen at a station in Seoul, South Korea. (EPA Images pic)SEOUL: North Korea has fired an unidentified projectile off its east coast, Seoul's military said Monday.

"North Korea fires unidentified projectile into the East Sea," the joint chiefs of staff said in a brief statement, referring to the body of water also known as the Sea of Japan.

The launch follows Pyongyang's test-firing of a ballistic missile earlier this month that it said incorporated artificial intelligence technology.

That missile, fired on Oct 3, "is capable of changing its flight orbit at a low altitude and AI was introduced into it", Kim Yo Jong, the powerful sister of North Korean leader Kim Jong Un, said at the time.