The US Embassy in Jordan says it is aware of a "security incident" at the Jordanian International Police Training Centre, where three people are said to have been shot dead.
A spokesperson told NBC News that US officials were in contact with local authorities.
A Jordanian security official has told NBC News that a gunman opened fire in a cafeteria at a US-funded training facility in Jordan, killing two Americans and their South African colleague.
A gunman who killed two Americans and a South African at a security training facility in Jordan has been shot dead by Jordanian security forces, officials say.
Earlier reports suggested the suspect had killed himself.
A third person has died following a shooting at a police camp in Jordan.
As well as two Americans, a South African was also killed in the compound, according to Jordanian officials.
A gunman has shot dead two Americans at a police training camp near Jordan's capital Amman, a security source has told Reuters.
The incident is said to have taken place at the Jordanian International Police Training Centre.
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Jordan's air force chief has said his country's jet fighters had conducted 56 raids in three days of intensified bombing targeting a stronghold of Islamic State militants in northeast Syria.
"We achieved what we aimed at. We destroyed logistics centres, arms depots and targeted hideouts of their fighters," General Mansour al Jbour, head of the Jordanian air force, told a news conference.
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US President Barack Obama is due to meet Jordan's King Abdullah II later today, a source familiar with the situation told Reuters.
The king is cutting short a visit to Washington after news of the killing of a Jordanian pilot by Islamic State militants.
Jordan's King Abdullah has said the killing of pilot Muath al-Kasaesbeh by Islamic State militants was an act of cowardly terror by a group that had nothing to do with Islam.
"This [is] cowardly terror by a criminal group that has no relation to Islam ... It's the duty of all citizens to stand together," he said in a short televised appearance.
The king cut short a visit to Washington after the news of the pilot's death.