AMMAN (REUTERS) - Three US military trainers were shot dead in Jordan on Friday (Nov 5) when their car failed to stop at the gate of a military base and was fired on by Jordanian security forces, a Jordanian military source said.
The incident occurred at the Prince Faisal air base in the south of the country, a close ally of the United States. Two trainers died immediately and a third died later in hospital.
A Jordanian army guard was also shot and wounded.
"There was an exchange of fire at the entrance to the base after an attempt by the trainers' vehicle to enter the gate without heeding orders of the guards to stop," the military source said.
"An investigation is now under way to know exactly what happened."
Another Jordanian security source said it was not possible to rule out political motives in the incident at an air base where dozens of US trainers work alongside Jordanians.
US officials, speaking on condition of anonymity, told Reuters they were reviewing the incident and could not rule out the possibility of a deliberate attack.
One said there were Americans in the convoy who were unharmed in the incident.
Many ordinary Jordanians harbour strong anti-American sentiment over Washington's strong support for Israel and its military interventions in the region.
Several incidents this year have jolted the Arab kingdom, which has been relatively unscathed by the instability that has swept the region since 2011.
A Pentagon spokesman confirmed the shooting incident.
"We are saddened to report that three US service members were killed today in a shooting incident at a Jordanian military base," Peter Cook said, adding more information would be provided "as appropriate".
Jordan hosts several hundred US contractors in a military programme which includes the stationing of F-16 fighter jets that use Jordanian airfields to hit Islamic State positions in neighbouring Syria.
Since the start of the Syrian conflict in 2011, Washington has spent millions of dollars to help Jordan set up an elaborate surveillance system known as the Border Security Programme to stem infiltration by militants from Syria and Iraq.
US officials say aid to Jordan, one of the largest recipients of US foreign military assistance, is expected to rise to US$800 million (US$1,107 million) in 2016 and grow in future years.
The last incident involving US personnel was in November last year when a Jordanian officer shot dead two US government security contractors and a South African at a US-funded police training facility near Amman before being gunned down.
The incident embarrassed the Jordanian authorities, who did not publicly disclose the motive of the assassin. The gunman was later said by security sources to have been a sympathiser of Islamic State with strong anti-Western feelings.
Six Jordanian border guards were killed in June by an Islamic State suicide bomber who drove a car at speed across the border from Syria and rammed it into a US-funded military post.