A man in an Afghan police uniform on Sunday shot and killed three foreign troops in southern Afghanistan, the US-led coalition said in a statement.
It did not give any other details, including the nationalities of the three. The statement said the man was wearing the uniform of the Afghan National Civil Order Police and that the incident was under investigation.
Their deaths bring to 218 the number of foreign troops killed so far this year.
Earlier, Afghan police said a roadside bomb killed five civilians in the eastern province of Ghazni.
Deputy provincial police chief Maj. Mohammad Hussain said a bus full of people struck the explosives Sunday morning while driving near Ghazni city, capital of the province of the same name.