APTOPIX South Korea Koreas Tension

Forces are on high alert as South Korea braces for a possible mid-range missile test by North Korea.

FOX's David Piper reports from Seoul, South Korea:

U.S. and South Korean forces remain on high alert for an expected missile test by the North. According to intelligence sources quoted here the North has been moving two Musudan intermediate missiles in and out of a facility in the eastern port of Wonsan to try to avoid detection. The sources say the North could fire a missile off at any time. Some reports suggest North Korea could test a missile or missiles on the 15th of April, the birthday of the country's founder Kim Il Sung, grandfather of current leader Kim Jong Un.

In Seoul, David Piper, FOX News Radio.