NEW ORLEANS (AP) -- Four more New Orleans police officers have been charged in the deadly shootings of two people in Hurricane Katrina's chaotic aftermath and could face the most serious punishment yet - the death penalty - for the killings that have brought down a string of other officers. Six current or former officers are charged in a 27-count indictment unsealed Tuesday. Five former New Orleans police officers already have pleaded guilty to helping cover up the shootings on the Danziger Bridge....