In another case , in which marines are suspected of killing 24 Iraqi civilians in Haditha last November , the second-ranking American officer in Iraq , Lt. Gen. Peter W. Chiarelli , has completed his review of an inquiry into whether Marine officers tried to cover up the shootings and is expected to announce his findings and recommendations in the next few days , said two military officials , who spoke on the condition of anonymity because the findings have not been made public .