The findings have not officially been made public yet, but U.S. military officials speaking on condition of anonymity told NBC News that the investigation found a number of Marines allegedly filed false reports claiming the civilians were victims of a roadside bomb by militants.
The probe also found higher officers allegedly ignored evidence that there may have been criminal activity in the case, the officials said.
CBS News reported that those officers were at every level up to and including the colonel who commanded the regiment involved in the incident.
Report: No coverup of Haditha -WASHINGTON TIMES
Report finds US Marines failed to probe Haditha: CBS - WASHINGTON POST
Haditha Probe Reveals 'Red Flags' - CBS2