"We found that 47 civilians, mostly women and children, were killed in the air strikes and another nine were wounded," Burhanullah Shinwari, the deputy speaker of Afghanistan's senate, said.
A nine-member team appointed by Hamid Karzai, the Afghan president, to investigate the strikes in the remote Deh Bala district. Shinwari led the team.
The International Committee of the Red Cross said on Wednesday that 250 civilians were killed or wounded in attacks in the past five days.
This figure includes the US-led air strikes and a suicide blast outside the Indian embassy in the capital on Monday that killed more than 40 people, including two Indian diplomats.