KABUL, Afghanistan — A NATO soldier was killed in southern Afghanistan when a man wearing an Afghan Army uniform turned his gun on him, the international coalition said Wednesday.

The shooting took place on Tuesday, NATO said. The coalition released only a brief statement, saying that “an individual wearing an Afghan National Army uniform turned his weapon against” the NATO service member, whose nationality was not specified.

A district police chief, Muhammad Nabi Shakir, said the shooting took place in the Marjah district of Helmand Province inside a military base run predominantly by American and Afghan forces.

The shooting appeared to be the latest in a mounting number of episodes in which Afghan soldiers or police officers — or insurgents wearing official uniforms — have opened fire on personnel of the American-led coalition.