Seoul, South Korea (CNN) -- North Korea is showing signs it could be preparing to carry out a new nuclear test, South Korea's Unification Minister Ryoo Kihl-jae said Monday, according to the semi-official South Korean news agency Yonhap. Ryoo made the comment in response to a South Korean lawmaker who cited unspecified reports suggesting there had been an increase in activity near the site of the North's three previous underground nuclear tests, Yonhap reported. The South Korean government had said Sunday that it believes North Korea may test a missile about April 10, citing as an indicator Pyongyang's push for workers to leave the Kaesong Industrial Complex by then.
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NEW: South Korean official cites indications another test is being planned
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U.S. commander in South Korea also cancels trip to Washington this week
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Seoul says Pyongyang is trying to make headlines as a scare tactic
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Switzerland offers to host a meeting between North and South Korea
Kaesong Industrial Complex
There are 518 people left in @placeholder, with 39 planning to exit Monday.
Pyongyang
Pyongyang
Before leaving the country, they were able to take in a rally in @placeholder.
South Korea
South Korea
South Korean
South Korean
South Korean
South Korean
South Korea
New reports of missile movements in North Korea have triggered military counteractions by @placeholder and the United States.
Yonhap
Yonhap
South Korea's semiofficial @placeholder news agency reported that the missiles were ready to launch, citing military sources in Seoul.
U.S.
A U.S. official told CNN that two medium-range missiles have been loaded onto mobile launchers on the east coast of North Korea, but a second @placeholder official said intelligence on that is not definitive.