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A still image taken from security camera video released by the New Orleans Police Department (NOPD) shows a gunman (bottom R) running away after shooting into a crowd gathered for a Mother's Day second line parade in New Orleans, Louisiana May 12, 2013. Police continued their search on Monday for the gunman, who wounded 19 people, including two children. REUTERS/NOPD8th/Handout via Reuters ( USA-SHOOTING-NEWORLEANS/ )

New Orleans Police investigate shooting at the intersection Frenchman Street at N. Villere on Mother's Day in New Orleans, Sunday May 12, 2013. Gunmen opened fire on dozens of people marching in a Mother's Day neighborhood parade in New Orleans on Sunday, wounding at least 17, police said. (AP Photo/Doug Parker) ( Mothers Day Parade Shooting )

New Orleans Police investigate shooting at the intersection Frenchman Street at N. Villere on Mother's Day in New Orleans, Sunday May 12, 2013. Gunmen opened fire on dozens of people marching in a Mother's Day neighborhood parade in New Orleans on Sunday, wounding at least 17, police said. (AP Photo/Doug Parker) ( Mothers Day Parade Shooting )

New Orleans police officer collects evidence at the scene of a shooting at the intersection Frenchman Street at N. Villere on Mother's Day in New Orleans, Sunday May 12, 2013. Gunmen opened fire on dozens of people marching in a Mother's Day neighborhood parade in New Orleans on Sunday, wounding at least 17, police said. (AP Photo/Doug Parker) ( Mothers Day Parade Shooting )

New Orleans Police Department members are seen at the site of a shooting of at least 12 people during a Mother's Day parade in New Orleans, Louisiana, May 12, 2013, as pictured in this photo provided by Fox 8 News. At least 12 people were shot at the parade in New Orleans, with one victim as young as 10 years old, WWLTV reported, citing police Superintendent Ronal Serpas. REUTERS/Fox 8 News/Handout ( USA-SHOOTING-NEWORLEANS )

Bystanders comfort a shooting victim while awaiting EMS at the intersection of Frenchmen and N. Villere Streets after authorities say gunfire injured at least a dozen people, including a child, at a Mother's Day second-line parade in New Orleans on Sunday, May 12, 2013. No deaths were reported. (AP Photo/The Times-Picayune, Lauren McGaughy) ( Mothers Day Parade Shooting )

Superintendent Ronal Serpas, left, supervises as New Orleans police officers investigate the scene at the intersection of Frenchmen and N. Villere Streets after authorities say gunfire injured at least a dozen people, including a child, at a Mother's Day second-line parade in New Orleans on Sunday, May 12, 2013. Serpas told reporters that a 10-year-old girl grazed by a bullet was among those wounded in the shooting. She was in good condition. He said three or four people were in surgery but their conditions weren't known. No deaths were reported. (AP Photo/The Times-Picayune, Michael DeMocker) ( Mothers Day Parade Shooting )

New Orleans police officers investigate the scene at the intersection of Frenchmen and N. Villere Streets in New Orleans after gunfire at a Mother's Day second-line parade on Sunday, May 12, 2013. Police spokeswoman Remi Braden said in an email that many of the 17 victims were grazed and most of the wounds weren't life-threatening. No deaths were reported. (AP Photo/The Times-Picayune, Michael DeMocker) ( Mothers Day Parade Shooting )

Bystanders comfort a shooting victim while awaiting EMS at the intersection of Frenchmen and N. Villere Streets after authorities say gunfire injured at least a dozen people, including a child, at a Mother's Day second-line parade in New Orleans on Sunday, May 12, 2013. No deaths were reported. (AP Photo/The Times-Picayune, Lauren McGaughy) ( Mothers Day Parade Shooting )

New Orleans police officers investigate the scene at the intersection of Frenchmen and N. Villere Streets after authorities say gunfire injured at least a dozen people, including a child, at a Mother's Day second-line parade in New Orleans on Sunday, May 12, 2013. No deaths were reported. (AP Photo/The Times-Picayune, Michael DeMocker) ( Mothers Day Parade Shooting )

New Orleans Police block off the intersection of Frenchmen and N. Villere Streets after authorities say gunfire injured at least a dozen people, including a child, at a Mother's Day second-line parade in New Orleans on Sunday, May 12, 2013. No deaths were reported. (AP Photo/The Times-Picayune, Lauren McGaughy) ( Mothers Day Parade Shooting )