North Korea launched a ballistic missile from a submarine but it likely failed in its early stage, the latest in a string of tests that are part of efforts by the North to advance technology capable of delivering nuclear warheads, the U.S. and South Korea said.

The U.S. Strategic Command said that the missile was tracked Saturday over the sea between the Korean Peninsula and Japan, where it apparently fell.

It was launched from a location near the North Korean coastal town of Sinpo, where analysts have previously detected efforts by the North to develop submarine-launched ballistic missile systems, said an official from Seoul’s Defense Ministry, speaking on condition of anonymity because of office rules. […]