Four police officers could face the death penalty after being accused of gunning down two unarmed people in the chaotic aftermath of Hurricane Katrina in New Orleans.
The city's corruption-plagued police department already faces several US federal investigations.
The four officers were charged along with two others in a 27-count indictment yesterday.
Five former New Orleans police officers have already pleaded guilty to helping cover up the shootings on the Danziger Bridge that left two men dead and four wounded just days after the August 2005 hurricane.
In one instance, a mentally disabled man was shot in the back and stamped on before he died.
Prosecutors say officers fabricated witness statements, falsified reports and planted a gun in an attempt to make it appear the shootings were justified.