NATO-led forces bombed a police checkpoint in eastern Afghanistan, killing at least four policemen and injuring two, a provincial governor's office said Monday, DPA reported
The airstrike by the International Security Assistance Force (ISAF) hit the checkpoint in the Wama district of Nooristan province Sunday night even though the Afghan flag was visible on its rooftop and all personnel were clad in police uniforms, it said.
The ISAF also deployed troops in the area and arrested 12 policemen, the office said.
"Repetition of such attacks would be unforgivable," Governor Jamal-u-Din Badr said.
Mohammad Zarin, an adviser for the governor, said no militant activity had been reported in the area.
ISAF spokesman Captain Peidro deAngelo said the ISAF was looking into the matter. "We are aware of the reports coming out from Nooristan," he said.
Foreign troops have mistaken Afghan security forces for militants several times in the past. In May, five Afghan security guards protecting ISAF supply convoys were killed in such an airstrike.