U.S. tracked North Korean submarine-launched missile: defense official

WASHINGTON (Reuters) - The United States detected and tracked a North Korean submarine-launched missile which flew about 300 miles (480 km) before splashing into the Sea of Japan, a U.S. defense official said on Tuesday. "This was likely a KN-11 ballistic missile," the official said, speaking on condition of anonymity. (Reporting by Phil Stewart; Editing by Eric Walsh)