A US marine has sparked world-wide revulsion after being seen shooting an injured and helpless Iraqi. The sickening scene was broadcast by Channel 4 News after a fire-fight in the rebel stronghold of Fallujah. The trigger-happy soldier had been asked to get nearer to the injured man. But instead of trying to capture him, the marine is seen leaning over a wall and cold-bloodedly shooting him. He then turns to his colleagues and says: "He's gone". Coalition chiefs were last night under pressure to investigate the incident