Guam authorities are printing fact sheets saying residents should not 'look at the flash or fireball' in case of an attack

Guam Governor Eddie Calvo told residents of the small U.S. island territory Friday that while the local threat level remains unchanged in light of North Korea's warnings this week, they should still be prepared in case of the worst. To help with preparations for "an imminent missile threat," Guam Homeland Security has printed a fact sheet with helpful tips like "do not look at the flash or fireball — it can blind you," Pacific Daily News reports.

Residents are advised to "find the nearest building, preferably built of brick or concrete, and go inside to avoid any radioactive material outside" if a warning is issued. Other tips instruct residents on how to remove radioactive material from their bodies, including placing "contaminated clothing in a plastic bag and seal or tie the bag" and "when possible, take a shower with lots of soap and water to help remove radioactive contamination. Do not scrub or scratch the skin."

Earlier this week, North Korea announced plans to launch four ballistic missiles aimed to fall between 18 and 24 miles from the coast of Guam. Guam's territorial waters extend 13.8 miles from shore, The New York Times reports.

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"There is no panic in Guam," Calvo told CNN. "I'm not trying to overlook it or understate it. We understand the threats, but we also don't want to panic anybody, and we don't want to jump to conclusions based on rhetoric."