WASHINGTON (AP) — A “friendly fire” incident in Afghanistan that killed five U.S. soldiers and one Afghan in June was caused by a series of avoidable miscommunications among air and ground forces, according to a military investigation report released Thursday.

The report from U.S. Central Command, which oversees operations in Afghanistan, cited a collective failure by soldiers, commanders and air crew members to execute the fundamentals of the mission. As a result, the five Americans and one Afghan were mistaken for enemy forces and were attacked with two laser-guided bombs.