Interim probe: Airstrikes may have killed up to 30 Afghan civilians

KABUL, Afghanistan (CNN) - American airstrikes earlier this month during a western Afghanistan battle with Taliban militants may have killed up to 30 civilians, an interim U.S. military report said on Wednesday.

The report is part of an ongoing investigation into a fight in Farah province, where villagers reported civilian casualties as a result of U.S. bombing runs on May 4.

"A review of the physical evidence is inconclusive in determining the exact number of civilian and insurgent casualties," the military said in a statement detailing the report.

"In all, the investigation team estimates that 60-65 Taliban extremists were killed in these engagements, while at least 20-30 civilians may have been killed during the fighting. The investigators continue to attempt to better confirm casualty numbers."