An alarm system is monitored, by an alert system that supplements the capabilities of the alarm system. The sensors, such as door, window, fire, and CO sensor can be monitored by the alarm system which can raise an alarm when a sensor is triggered. The alert system detects that the alarm system has raised an alarm. The alert system can then communicate the alarm locally to other alert system installations. People at those other alert system installations are thereby alerted to the alarm and can respond to it.