The U.S. military pressed ahead Saturday with a high-stakes search-and-rescue operation for a missing American airman after Iran shot down a U.S. F-15E Strike Eagle fighter jet on Friday, while Iranian state media urged citizens in rugged southwestern provinces to hunt for the "enemy pilot" and hand him over alive in exchange for a "precious prize."

The incident marked the first confirmed loss of a U.S. manned aircraft over Iranian territory since the conflict between the United States and Iran escalated nearly six weeks ago. One of the two crew members aboard the two-seat F-15E was rescued by U.S. special forces in a daring operation, but the status of the second service member — believed to be the weapons systems officer — remained unknown as of early Saturday, U.S. officials told lawmakers and reporters.