Yonhap, the South Korean news agency, said North Korea appears to be moving its mobile missiles early Friday to make it difficult for US intelligence to monitor them. Yonhap quoted sources familiar with the matter.
Officials in South Korea and Japan have said they do not think North Korea will fire a missile at any of its enemies. However, they fear a missile could go off course and hit people.
This launch is particularly troublesome, after a tsunami of threats from North Korea, because it is possible they will launch a longer-range missile that has not been tested yet.
The BBC quoted North Korea as saying war could break out at any time.
The US has said its response to any attacks will be proportional. For example, if a few artillery shells are fired, South Korea will reply with a similar barrage.
The New York Times reported South Korea is trying to calm tensions, calling for dialogue. Seoul says investors are concerned about putting more money in the country.
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