A Greek air force jet has crashed at an air show north of Athens and the plane's two pilots were killed. The crash of the twin-seat Phantom F4 jet occurred during a low-altitude maneuver. The resulting fire sent large plumes of black smoke into the air in front of several thousand spectators on Saturday. There were no injuries among the attendees. Air force officials in Greece said that the bodies of the two pilots were located during a rescue operation 60 kilometers or about 40 miles north of Athens. Air show organizers canceled remaining events.