In a telephone interview with the Associated Press, Safi said the victims were police officers who were operating with the army in the area.
The US air strikes are part of a North Atlantic Treaty Organisation mission to support Afghan forces against the Taliban.
Grishk police chief, Mohammad Ismail Khpalwak, said over ten members of the police force were killed in the strike.
The U.S. military confirmed an airstrike it conducted Friday resulted in the deaths of friendly forces.
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A spokesman for the Taliban Qari Yousuf Ahmadi earlier claimed that the elder son of Mullah Hebatullah Akhundzada has carried out a suicide attack in Greshk district of Helmand province. Meanwhile, a police source said up to 30 had been killed.
The militant group, the target of a US-led invasion of Afghanistan in 2001, has managed to gain more footholds across the country over the past years and is thought to be in control of at least 40 percent of territories.
The friendly fire incident happened in the Gereshk district where intense fighting was raging between Afghan forces and Taliban insurgents. It wasn't immediately clear if they had been kidnapped or whether they had escaped.
No one has claimed responsibility for the attacks, nor is it known whether any ransom demands have been made.
Afghanistan's Independent Human Rights Commission issued a statement condemning the attacks and warning they represented a human rights violation. Taliban have in the past exaggerated their successes and the remoteness of the area made it impossible to independently verify.
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