An errant US airstrike confirmed by the Pentagon killed 12 Afghan National Police officers and wounded two others, Helmand provincial police chief Abdul Ghafar Safi said on Saturday.
The death toll in the airstrike of Friday was determined after a site inspection of the compound in Gereshk District, he said.
In the statement, the US offered its condolences to the families of the security forces who were killed.
While much of Helmand province is under the control of Taliban, Afghan national security forces have been waging fierce battles to retake territory. NATO and US troops are in Helmand to assist Afghan troops.
Safi told The Associated Press in a telephone interview that the dead were police officers who were operating with the army in the area.
He said they had recaptured the post from the Taliban when the airstrike occurred. Yesterday, the Helmand Governor Hayatullah Hayat said it was believed the police officers were not in uniform, which may have resulted in mistakenly identifying them as Taliban fighters.
Elsewhere in Afghanistan in northern Badakhshan province, Governor Ahmad Faisal Bigzad said on Saturday that 11 police were killed and another six wounded during a roaring battle with Taliban insurgents in the remote Tagab region.
Bigzad said another 20 members of a local police force were missing following firefight of Friday.
It wasn't immediately clear if they had been kidnapped or had escaped.
The area in which the fighting occurred is tucked inside a mountainous region where access is restricted and even telephone contact is erratic.