Guam Homeland Security issued a new fact sheet Friday, which the agency says will help residents prepare for an imminent missile threat…

The advice includes tips such as: “Do not look at the flash or fireball – It can blind you” and “Take cover behind anything that might offer protection.”

“Lie flat on the ground and cover your head. If the explosion is some distance away, it could take 30 seconds or more for the blast wave to hit,” the sheet states.