3 US Service Members Killed in Gunfire at Jordanian Military Base

Two died later from injuries in the shooting at King Faisal base in Al-Jafr.

One U.S. service member was killed at the scene. Two others, who had been medevaced to King Hussein Hospital in Amman with critical injuries, died at the hospital, a U.S. military official told ABC News.

Jordan's state-run Petra news agency, which originally reported that two U.S. trainers had died, said the car failed to comply with orders to stop at an entrance and gunfire erupted.

In a statement on Facebook, the Jordanian military said a Jordanian Air Force officer was also injured in the gunfire outside the base in the southern city of Al-Jafr.

An investigation by the Jordanian military is underway to determine the cause of the incident.

"We are working closely with the government of Jordan to determine exactly what happened," the Pentagon statement said. "Our thoughts and prayers are with the loved ones of these service members. We will provide more information as appropriate."

ABC News' Ben Gittleson contributed to this report.