An access control system utilizes authorized users' mobile electronic devices for transmitting biometric identifiers in combination with using an access card, for authenticating the user's access privileges for unlocking a secure door. The system may further verify proximity of the user's device to the access control reader, which verifies correspondence of the access card with the transmitted biometric characteristics. The system may further require entry of a PIN into the user's device, for its transmission to the access control system for access confirmation. A scanner scans the area around its geographic location for signals emitted by mobile electronic devices, and identifies a position, a type, and an address of each device, using characteristics of the signals. Audio analytics detect/identify a position of sudden sound fluctuations indicating a gunshot/fight incident, and correlates the incident location to a device location. Video analytics correlate imaged people with detected electronic devices.