Abstract: A security system for a building has multiple lock modules. Each lock module is associated with a particular door and has an unlocked position that allows the particular door to open and a locked position that prevents the particular door from opening. Each lock module includes a door status signal and a controller. The door status signal includes a unique identifier for the particular door associated with the lock module and a status that identifies when the lock module is in the locked position. The controller transmits the door status signal for the lock module. A lock module command signal received by at least some of the lock modules directs at least some of the lock modules to reposition to either the unlocked position or the locked position.