Two Americans and a South African were shot dead on Monday at a police training centre in capital Amman by a Jordanian policeman.
Jordan's Minister of State for Media Affairs Mohammad Momani said the three victims were all trainers at the police training facility in Al Mwaqqar area, Xinhua news agency reported.
The attacker was later killed by the police force on site, Momani said.
Two other American trainers and four Jordanians were injured in the attack.
The cause of the attack was not yet known.