Six NATO troops were killed Wednesday when an Afghan army pilot opened fire on his foreign trainers at the Kabul airport, officials said, DPA reported.
"Six International Security Assistance Force (ISAF) service members died following a shooting incident," the alliance military said in a statement.
The shooting began after an argument between the attacker and foreign officers inside the military airfield, adjacent to the capital's international airport, the Defence Ministry said.
Army spokesman General Zahir Azimi said the attacker, a veteran military pilot, was killed in the exchange of fire. He said two Afghan army soldiers were also injured.
The ISAF statement did not disclose the nationalities of the deceased soldiers, but Al Jazeera's English-language news service quoted a source saying six of those killed were US soldiers.
Taliban spokesman Zabiullah Mujahid took responsibility for the attack in a statement sent to media. He claimed the shooter was a sleeper agent who used an Afghan army uniform and gained access to the military airport with the cooperation of an insider.
He said nine NATO troops and five Afghan soldiers were killed in the suicidal attack, while the shooter, identified as Azizullah, was also killed after he spent his ammunition.
Recent weeks have seen a wave of attacks by militants dressed in Afghan military uniforms, including several suicide bombings.