France is now under its emergency disaster plan—called the red plan or plan rouge—after attacks in Paris have left more than 100 people dead.

The national plan is put into effect when an area of that country suffers a large number of casualties because of a natural or man-made catastrophe, such as a fire, industrial accident, or terrorist bombing. One of its key overarching responsibility is coordinating emergency teams and resources in order to get fast medical treatment to the injured. The red plan is part of France’s overall emergency strategy to deal with an influx of hospital patients, known as the Orsan plan.

Plan Rouge Multi-attentats déclenché. La @PCParis mobilisée depuis 21h40 pic.twitter.com/0UnFb6N6WN — Protection Civile 75 (@PCParis) November 13, 2015

According to The Guide to Emergency Management in Health Care, a field clinic is set up near the disaster area to triage those who are hurt before they’re moved to designated hospitals. The red plan helps create these on-site medical centers and handles the logistics of transporting patients and handling resources.

French lawyer and blogger Maitre Eolas talked about the red plan on Twitter:

“It gives exceptional powers to the prefects [the head of departments]. Essentially three: establish curfews in areas, restricting access to areas, and banning some people from entering the department. It lasts 12 days, i.e. until November 26 inclusive. A law is required to extend it beyond that.”

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