Why Are Some Countries Issuing Emergency Preparedness Advice?

I have seen claims that countries including the UK, France, Italy and Switzerland are advising residents to keep food and other essentials at home for a few days. There are also reports that US military facilities have been told to prepare for longer periods of self-sufficiency, including power and water supplies. Are these claims verified, and what is driving them? Could this be routine emergency planning, or is there a wider global security concern people should know about?

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