Guam Homeland Security released a safety fact sheet to the island's 160,000 residents on "preparing for an imminent missile threat" in response to North Korea's possible missile launch toward the U.S. territory.

"Do not look at the flash or fireball — it can blind you," the fact sheet instructed people who might be outside if the missiles arrive. "Take cover behind anything that might offer protection."

Officials will use "all forms of mass communication to alert the public" of news before, during, and after the incident, and people should expect to stay inside for 24 hours after the attack.

The government instructed residents to create an emergency supply kit, come up with a family emergency plan, and a list concrete shelters in the nearby vicinity of places they visit that could be used in the case of an attack.

Residents should take shelter immediately, even if they are miles from the site of the attack because radioactive fallout can be carried by the wind.

Anyone caught outside during the blast should do everything possible to avoid radioactive material.

"Remove your clothing to keep radioactive material from spreading. Removing the outer layer of clothing can remove up to 90% of radioactive material. If practical, place your contaminated clothing in a plastic bag and seal or tie the bag. Place the bag as far away as possible from humans and animals so that the radiation it gives off does not affect others," it said.

"When possible, take a shower with lots of soap and water to help remove radioactive contamination. Do not scrub or scratch the skin. Wash your hair with shampoo, or soap and water. Do not use conditioner in your hair because it will bind radioactive material to your hair," the warning stated.

North Korea was reported Thursday to have outlined a plan to simultaneously launch four ballistic missiles toward Guam, a U.S. territory in the Pacific Ocean that is home to a major military base.

Officials in the regime say the plan is to have the missiles hit the water from 19 to 25 miles away from Guam, and that the proposal is expected to be presented to leader Kim Jong Un for approval or rejection within a week.