More N Korea missile tests 'no surprise' to US

North Korea has told foreign diplomatic missions in Pyongyang to consider evacuating their employees, as tensions increase over the country's anti-American threats and rhetoric.

Earlier, there were reports from South Korea that the North had loaded two medium-range missiles on to mobile launchers and moved them across the country.

In Washington, the White House spokesman, Jay Carney, said he would not be surprised if North Korea was preparing to launch a missile.