An attacker wearing an Afghan army uniform has opened fire on a group of NATO troops in eastern Afghanistan, killing one service member.

Friday's shooting is at least the 15th incident this year in which an Afghan soldier or an insurgent disguised as a soldier has fired on NATO troops.

A NATO statement did not identify the nationality of the service member killed or indicate the status of the gunman.

However, the French news agency says a provincial police chief identified the attacker as an Afghan soldier who managed to flee the scene.

Earlier this month, NATO said coalition forces shot and killed a man dressed in an Afghan army uniform after the man fired on a group of coalition soldiers, leaving one dead.

In April, an Afghan soldier shot and killed an American service member in southern Kandahar province.

The incidents have raised concerns about security in Afghanistan at a time when international combat troops are preparing to withdraw from the country.

International forces are set to transfer full security responsibility to Afghan forces by a 2014 deadline.

In another development, Germany says Afghan President Hamid Karzai and German Chancellor Angela Merkel will discuss the withdrawal of German troops from Afghanistan, next week.

A spokesman for Chancellor Merkel announced Friday the two leaders will meet in Berlin on Wednesday for wide-ranging talks ahead of NATO summit in the U.S. later this month.

Germany has one of the largest contingents of soldiers serving in the NATO mission in Afghanistan.