Three Americans who worked in a Christian hospital located in Kabul were killed Thursday after an Afghan security official opened fire.

Several were also wounded in the attack, The Washington Post reported. It occurred in mid-morning, as doctors and nurses started to arrive for work.

Cure International Hospital is part of an international grouping of medical facilities that are operated by a charity that’s headquartered in Pennsylvania.

The U.S. Embassy in Kabul put out this statement: “With great sadness, we confirm that three Americans were killed in the attack on CURE Hospital. No other information will be released at this time.”

A spokesman for the Afghan Ministry of Interior said the shooter was an Afghan police officer, The Post reported. He tried to commit suicide after the attack, but police quickly stepped in and arrested him.

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