Three International Security Assistance Force (ISAF) soldiers were killed when a local policeman opened fire on them in southern Afghanistan, the alliance said on Saturday.

“According to current reporting, an Afghan working on an installation that is shared by Afghan and ISAF forces, shot and killed three ISAF servicemembers,” ISAF said in response to an email from Pajhwok Afghan News.

Both Afghan and ISAF officials are currently investigating the incident, the NATO-led force said, adding the shooter had been detained.

A local official said on condition of anonymity a local police official opened fire on US troops, killing one and injuring three others, in the Garmser district of Helmand late on Friday night.

The attacker was detained by NATO-led forces, he added.

Daud Ahmadi, the governor’s spokesman, confirmed the shooting -- the second attack on foreign forces in Helmand in two days. However, the spokesman had no further details.

A Taliban spokesman, Qari Yousuf Ahmadi, asserted responsibility for the attack. He said they had killed seven US soldiers, including two advisors, through a policeman loyal to the Taliban.

A day earlier, another police officer opened fire on the international troops, killing three of them in the Sangin district of the province. It was the fifth attack on US troops by Afghan security personnel.

Source: Pajhwok Afghan News Agency