In the event of a terrorist attack, the app displays a white “ALERT” sign, along with a short description of what's going on, against a solid red backdrop on the smartphone's display. The user may also get further information, such as whether a police operation is underway and how to react properly to the situation. As a precaution, the app features no sound notifications or vibration in order not to draw the attention of possible attackers.
The SAIP app also includes alerts and tips on how to react to other situations, such as nuclear attacks and natural disasters. Initially, the French interior ministry considered a similar system for alerting citizens via SMS, but that was quickly ruled out, given the cost of the operation and the speed of delivery of alerts. Instead, notifications are pushed to the app as soon as the authorities get a word on what's happening, and users have the option of sharing the information on Twitter and Facebook.You can find SAIP on the Google Play Store and the App Store.
Source: Liberation (translated) via The Guardian
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