On Friday, officials met with ambassadors to ask if they needed help evacuating their personnel, several diplomatic missions said.
The same concern apparently does not extend to foreign tourists.
On Saturday, Amanda Carr, who works for a British travel company, wrapped up a pleasure tour of North Korea with a group of 20 tourists. Before leaving the country, they were able to take in a rally in Pyongyang.
The UK's embassy in North Korea gave her company, Koryo Tours, some advice in light of the international tensions. "We've been advised to continue with the tours," Carr told CNN's Rafael Romo.
Her North Korean partners -- from the state's travel agency -- continue to accept tourists, she said. And their demeanor is friendly towards them, as it always has been.
Can you imagine that as a conversation piece? "Hey, you wanna see my photos from Pyongyang?" It would get my attention.