In a brief news release about the attack Tuesday, NATO's International Security Assistance Force said a "service member died when an individual wearing an Afghan National Security Force uniform fired his weapon at ISAF individuals in southern Afghanistan today."
The news release said the ANSF and ISAF forces were investigating the incident but did not say where in southern Afghanistan the shooting occurred or give any other details.
The New York Times, quoting officials, said it occurred at Kandahar Air Field. The report said one coalition force soldier died and at least four others were wounded when the attacker on a tower fired at a passing convoy of coalition vehicles Tuesday morning.
The attacker was later described as a five-year veteran soldier.
Officials said during questioning, he said he was disgruntled because foreign forces had conducted raids and frequent searches of his village in eastern Afghanistan, The Times reported. The officials said they did not think the attack was carried out by the Taliban, which in the past have often claimed responsibility for insider attacks.
Tuesday's incident was the sixth insider attack, also referred to as green-on-blue violence, in the country this year in which nine coalition soldiers died.
Insider attacks have become a major threat for NATO and U.S. forces, although they have come down lately as a result of a number of precautionary measures put in place by the coalition forces.