An autonomous weapon system including weapon (9) and weapon mounting system (7, 8) operable to point the weapon (9) in accordance with input control signals. The weapon system includes a sensor (2) to acquire images and other data from a target zone and an image processor (3) to process acquired image data and identify potential targets (1) according to predetermined target identification criteria. Targeting system (4, 5) provides input control signals to the weapon mounting system (7, 8) to point the weapon (9) for firing at potential targets (1). A control system operates targeting system (4, 5) and fires the weapon (9) at selected targets (1) according to a predetermined of rules of engagement. The rules of engagement include combat, peacekeeping or policing scenarios. Remotely located operator (10) may amend the rules of engagement, or override the control system as required.