Via HotAir, CBS News reports that "North Korea is urging all foreign companies and tourists in South Korea to evacuate or find out where they can take shelter because it says the rival Koreas are on the eve of a nuclear war. The new threat appeared to be an attempt to keep the region on tenterhooks over its intentions.
Analysts see a direct attack on Seoul as extremely unlikely, and there are no overt signs that North Korea's 1.2 million-man army is readying for war, let alone a nuclear one."
So telling people to evacuate or take cover is not an overt sign? Capability and intent. They have nuclear weapons, they are demonstrating intent.
I remember reading the words a Holocaust survivor had taught his son about what he had learned
"When someone says they are going to kill you—you must believe them."