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What to do immediately
- Outdoors: Go into the nearest suitable building or underground space. If neither is close enough, take cover behind an object or lie down and protect your head.
- Indoors: Move away from windows. If you can, use a room without windows.
- In either situation: Keep listening for official updates and follow local instructions. An alert is a warning; it does not by itself confirm an impact or detonation.
Osaka Prefecture warns that a ballistic missile may arrive in less than 10 minutes after launch. That is Osaka’s guidance, not a universal estimate. Its practical implication is to take protective action immediately rather than wait for more details. Osaka Prefectural Government
Where to take shelter
Choose protection you can reach safely and quickly. Tokyo and Osaka guidance favors a nearby sturdy building or underground space. Osaka says not to risk a long trip to a designated temporary shelter when a nearer place to shelter or take cover is available. Tokyo Metropolitan Government · Osaka Prefectural Government
| Option | When it makes sense | What to do |
|---|---|---|
| Nearby sturdy building | One is close enough to reach promptly | Go inside and move away from windows. |
| Underground space | One is nearby and accessible | Go underground rather than traveling a long distance for a different shelter. |
| Cover outdoors | No suitable building or underground place is close enough | Take cover behind an object, or lie down and protect your head. |
In Osaka’s guidance, designated “emergency temporary shelters” are sturdy concrete buildings or underground facilities intended to reduce direct harm from blast. Check likely shelters in advance, but do not cross town to reach one after an alert if closer protection is available. A shelter can reduce exposure; no source cited here says it guarantees safety. Osaka Prefectural Government
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If you are already inside
- Move away from windows and glass.
- If accessible, go to a windowless room.
- Stay tuned to official updates and follow instructions for your location.
If a detonation has occurred or fallout may be present
This is a different situation from responding to a routine alert. The U.S. Naval Base Guam all-hazards guide advises people to get inside, stay inside, and stay tuned for official updates. If you may have been outdoors after fallout arrived, it advises removing your outer clothing layer and washing exposed skin or hair with soap and water when available. Follow local emergency officials’ directions on how long to shelter, whether to evacuate, and any decontamination steps; the Guam guide is for a U.S. military installation, and conditions and instructions vary. U.S. Naval Base Guam
How to receive warnings and prepare in advance
Learn your local alert channels
Warning systems vary by place. Tokyo’s guidance describes J-Alert transmitting urgent information to local authorities and activating municipal disaster broadcast systems. It also lists emergency mobile mail, television, and radio as ways residents in Japan may receive alerts or information. These are Japan-specific examples, not universal channels; learn which systems your local emergency agency uses. Tokyo Metropolitan Government
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Plan for staying informed and sheltered
The Naval Base Guam guide suggests keeping an emergency kit where you may need to shelter. Its listed supplies include water, packaged food, emergency medicines, a flashlight, spare batteries, and a hand-crank or battery-powered radio for receiving information during a power outage. These are optional preparedness supplies, not prerequisites for taking immediate shelter. U.S. Naval Base Guam
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