SEOUL-- South Korea's spy agency said Wednesday that it does not rule out the possibility of North Korea conducting yet another nuclear test following its latest launch of what appears to be an "upgraded" intercontinental ballistic missile (ICBM).

During its parliamentary briefing, the National Intelligence Service (NIS) also said the first long-range missile test since the two earlier tests in July appears intended to show off its capabilities to strike the U.S. mainland, voice discontent over China's enforcement of sanctions against it and strengthen internal unity.

After a 75-day lull, Pyongyang fired off the missile from the vicinity of Pyongsong, South Pyongan Province, around 3:17 a.m., Seoul's Joint Chiefs of Staff said. The missile flew 960 kilometers at an apogee of around 4,500 km, it said.

Source: Yonhap News Agency