An app that, when activated, communicates with all other phones that have the app. It should sense motion, silence all the phones, turn on audio/video recording and notify authorities, who also have the app. If all users stay immobile, the app should be able to sense and transmit movement in a building or outdoor area. This would be used in the settng of an active shooter or other setting where multiple lives are in danger. It would give authorities needed location data plus documentation of the event. The goal would be to save lives/minimize casualties and share information with authorities. In a properly outfitted building, the app could lock doors and possibly sequester a shooter. Please help me protect the lives of people who find themselves in these awful situations.