<p>A detection system and method having at least one detection unit, and a control centre unit. The detection unit includes at least one sensor configured to generate sensor data correlated to sensed conditions, a locator for actively determining location data corresponding to the location of the detection unit, and a communicator configured to communicate the sensor data and location data. The control centre includes a receiver for receiving the sensor data and the location data, together with a control processor which is configured to determine a threat level correlated to the sensor data.</p>
