A man wearing an Afghan army uniform shot and killed three U.S. service members, the U.S. military command said Friday. Afghan officials said the victims were American special operations forces troops.

Reuters reported that an Afghan police commander opened fire on the service members after inviting them to a meeting to discuss security. A U.S. military official confirmed the three deaths and said another service member had been injured during the incident.

NBC News’ Jim Miklaszewski reported that a “lone gunman” remained on the loose and was being hunted. U.S. military officials said the victims were part of a “special operations village stability mission.”

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