NATO said Thursday that a man wearing an Afghan National Army uniform killed a coalition service member.

The incident late Wednesday in southern Afghanistan was the latest in a series of attacks on international troops by their Afghan counterparts.

NATO did not give any other details but said the man who opened fire was killed when coalition forces returned fire. A joint Afghan and coalition team is investigating the incident.

According to the U.S. Defense Department, at least 80 NATO troops have been killed by Afghan security forces since May of 2007. U.S. officials say many of the so-called “insider attacks” are motivated by personal issues.

Also Thursday, Afghan officials said a mortar fired during fighting between NATO troops and insurgents hit a house in Wardak province, killing three women.

At least four other women were wounded in the Chak district.

In the northeast, authorities say a group of Taliban insurgents stormed a police post late Wednesday, killing at least four police officers and and capturing 16 others.

The attack took place in Badakhshan province, which borders Pakistan, Tajikistan and China.

Deputy Provincial Governor Shams ul-Rahman told reporters that two police officers were also wounded in the ambush.

International combat troops are in the process of withdrawing from Afghanistan and transferring full security responsibility of the country to Afghan forces by a 2014 deadline.