This article is from the archive of our partner .

A South Korean newspaper is reporting that North Korean troops are scurrying around the site where it tested a nuclear bomb on February 12, its third ever. All signs point to a fourth, and the timing couldn't be worse. "There are recent active movements of manpower and vehicles at the southern tunnel at Punggye-ri," says the newspaper JoongAng Ilbo. "We are monitoring because the situation is similar to behavior seen prior to the third nuclear test." Meanwhile, South Korean officials say that they expect North Korea to test another missile this week, probably on Wednesday.

Well, this isn't good. The tense situation between the North Korea and, well, pretty much everyone on Earth has been escalating in the weeks since that third test and has become increasingly severe since last week, when supreme leader Kim Jong Un's top brass promised a "merciless" attack on the United States. South Korea is more or less preparing for a war, while the United States has threatened a swift and decisive response it there is an attack. Even though President Obama's senior advisor Dan Pfeiffer played down the threat of violence — he said this is just "a pattern of behavior we've seen from the North Koreans many times — the U.S. military's been drawing up a plan in case it does. Accordingly, the U.S. commander in South Korea canceled a pre-planned trip to Washington, just in case something does go down this week.