SEOUL, South Korea (AP) — South Korea's military says North Korea has launched another ballistic missile.

The launch is part of a string of test-firings in recent months as the North works to build a nuclear-tipped missile that could reach the United States.

The South's Joint Chiefs of Staff said in a statement that Tuesday's launch was made from North Korea's North Phyongan province. The joint chief's statement says the launch was immediately reported to South Korean President Moon Jae-in.

It wasn't immediately clear if this was a routine firing of a short-range missile or an attempt to perfect North Korea's longer range missiles.