A relative of the family was traveling in a vehicle that the US struck in Kabul saying the vehicle had a suspected suicide bomber said that the vehicle was carrying 10 members of the same family including six children.

Although the US has not confirmed the killing of civilians, it has said it can't deny the claims and is investigating the incident.

"It's wrong, it's a brutal attack, and it's happened based on wrong information," Ramin Yousufi, a relative of the victims, said.

He added, tearfully: "Why have they killed our family? Our children? They are so burned out we cannot identify their bodies, their faces."

BBC quoted Emal Ahmadi, who lost his 2-year-old daughter in the airstrike, who said he and others in the family had applied for evacuation to the US and had been waiting for a phone call telling them to go to the airport.

Ahmadi further told the BBC that his relative Ahmad Naser, who was killed in the strike and had previously worked as a translator with US forces. 

Other victims in the airstrike had also previously worked for international organizations and held visas allowing them entry to the US.

Pentagon press secretary John Kirby said that he can not dispute the reports.

However, he continued to defend that what happened in Kabul was what they believed to be completely real and was a very specific and imminent threat.