AMMAN, Jordan — A Jordanian police captain opened fire Monday on instructors at an international police training center in Jordan’s capital, killing at least five people, including two Americans, before being shot dead by security forces.

It was not clear if there was a political motive to the shooting spree, which also wounded six people, including two Americans. But concern has swirled in staunchly pro-Western Jordan over possible revenge attacks by Islamic militants since the country assumed a high-level role in the U.S.-led military campaign against the Islamic State, which controls large areas of neighboring Syria and Iraq.

The unprecedented assault inside a Jordanian security compound also raised questions about the kingdom’s image as an island of relative stability in a turbulent region.

The shooting happened at the Jordan International Police Training Center in Amman, where Jordanian and foreign instructors, including Americans, have trained thousands of police officers from the Palestinian territories and other parts of the Arab world in recent years.

The Jordanian officer opened fire, killing the two Americans and a South African contractor before being shot dead, government spokesman Mohammed Momani said. Two Jordanians were critically wounded and later died, he said.

Momani did not release the assailant’s name, but a former Jordanian parliament member, Suleiman Saed, identified him as his 29-year-old relative, Anwar Abu Zaid, a captain in the police force.

In Washington, President Obama said that “we take this very seriously and will be working closely with the Jordanians to determine exactly what happened.”

State Department spokesman James Kirby said the two slain Americans worked for DynCorp International, a major military contractor, in a program funded by the State Department’s Bureau of Diplomatic Security and Bureau of International Narcotics and Law Enforcement. The two wounded Americans are also civilians, the State Department said.

The shooting coincided with the 10th anniversary of the bloodiest attack by Islamic militants on Jordanian soil – triple hotel bombings in Amman that killed 60 people and wounded more than 100. But with the attacker’s motives unknown, it was not clear if there was any link.

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