A soldier in Afghanistan has attacked U.S. troops at a military base, in the northern Balkh province on Saturday, wounding seven.

The U.S. soldiers were evacuated after the “insider attack” a spokesman for the US military command said.

The NATO-led Resolute Support mission said one Afghan soldier was killed and another injured in the incident at Camp Shaheen, in Mazar-e Sharif city.

However, earlier reports of American soldiers being killed were dismissed. But it is not clear whether the Afghan killed was also the attacker.

The Taliban have said the shooting was carried out by a man loyal to them, according to Reuters.

The attack, which took place at about 14:00 local time (09:30 GMT), was under investigation.

It comes a week after an Afghan army commando shot dead three US special forces soldiers in eastern Afghanistan.