New Orleans Police investigate a double homicide in the parking lot in front of Mardi Gras World in New Orleans on Tuesday, March 4, 2014. (AP Photo/The Times-Picayune, Michael DeMocker)
FILE - In this file photo image taken from video and provided May 13, 2013 by the New Orleans Police Department, a possible shooting suspect in a white shirt, bottom center, shoots into a crowd of people during a Mothers Day, Parade in New Orleans. Gunfire one bozy Mardi Gras weekend, a mass shooting at a jazz music parade and the gunshot deaths of three children in 2013 nearly overshadowed a promising statistic New Orleans Mayor Mitch Landrieu touts as he seeks re-election Saturday: the city’s murder rate dropped last year by nearly 20 percent. Still, the violence stubbornly continues and crime is a major election issue as Landrieu seeks four more years. Though many voters say they still don’t feel safe, local pundits say Landrieu is positioned to beat two fellow Democrats, with a runoff date of March 15 if needed. (AP Photo/New Orleans Police Department, File)
Assistant Attorney General Thomas E. Perez (left) announces results of a 10-month investigation that found New Orleans police officers engaged in unconstitutional conduct and violated federal laws. Also at the Thursday news conference were Mayor Mitch Landrieu (center) and Deputy Attorney General James Cole. (Associated Press)