The United Nations Assistance Mission in Afghanistan (UNAMA) conducted an investigation over four months looking into what happened May 5 when the US military bombed dozens of sites it had identified as Taliban methamphetamine labs.
In a statement, UNAMA said it had "verified 39 civilian casualties (30 deaths, five injured and four undetermined), including 14 children and one woman, due to the 5 May air strikes".
The agency went on to say that it had also received "credible information" about an additional 30 deaths -- mostly women and children -- and was working to further verify these claims.
US Forces-Afghanistan (USFOR-A) blasted the UNAMA findings, questioned the agency's methodology and insisted its "precision" strikes had accurately targeted meth labs.
"In addition to imagery collection during the precision strikes, USFOR–A conducted exhaustive assessments of the facilities and surrounding areas after the strikes," the command said in a statement, AFP reported.
"Combined assessments determined the strikes did not cause deaths or injuries to non-combatants."