North Korea warned it can no longer guarantee the safety of foreign diplomats after April 10th, and told embassies to consider moving their staff out of the country.
The U.S. has no embassy there, but communicates with North Korea through Sweden’s embassy.
Many diplomats say they view the country’s latest warning with suspicion.
Sweden has so far not indicated it will move any of its embassy workers.
Thursday, North Korea moved missiles to its eastern coast and threatened a nuclear strike.
Most military analysts say those missiles could not reach the U.S., but may threaten South Korea, Japan and Guam.
As a precaution, the U.S. has bolstered its missile defense systems in Alaska.