A U.S. jet fired missiles Friday into the Sunni insurgent stronghold of Fallujah, killing one man, witnesses and hospital officials said. The U.S. military had no immediate comment. It was the fourth straight day that American warplanes have been in action over Fallujah, which is under control of insurgents bent on ousting coalition forces from the country. Friday's airstrike killed an employee of the Fallujah municipality, said Dr. Ahmed Thaer of the Fallujah General Hospital.