"A total of three US service members died today in the incident in Jordan," the official said. "Initial reports were that one was killed, two injured. The two injured service members were transported to a hospital in Amman, where they died."

"The service members were in vehicles approaching the gate of a Jordanian military training facility, where they came under small arms fire," the official added. "We are working with the Jordanian government to gather additional details about what happened."