1. A system for generating alerts based on events in an environment, the system comprising: a plurality of cameras for producing video signals representing at least a portion of a environment; a video-processing module for analyzing the video signals to identify objects within the environment; a data-input module for receiving non-video data from at least one sensor-based monitoring system, the data representing one or more events relating to at least one of the identified objects; and an alert module for generating alerts based on at least one of the events.