Police say they have arrested a second suspect in the shooting that injured 20 people at a parade on Mother's Day.
Police Chief Ronal Serpas identified the second suspect as 24-year-old Shawn Scott, brother of 19-year-old Akein Scott.
Akein Scott was arrested Wednesday night. Serpas says Shawn Scott was arrested Thursday.
Both face 20 counts of attempted second-degree murder.
Akein Scott appeared before a magistrate judge Thursday. His bond was set at $10 million.
Serpas says four additional people have been arrested and charged with harboring the suspects.
Serpas says investigators believe the Scotts worked together in the shooting.
Video released Monday showed a crowd gathered for the Sunday parade suddenly scattering in all directions, with some falling to the ground. They appear to be running from a man in a white T-shirt and dark pants who turns and runs out of the picture. Police said they identified the suspect from the surveillance camera images.
As many as 400 people had come out for the event. Officers were interspersed with the marchers, which is routine for such events. The crime scene was about a mile-and-a-half from the heart of the city's French Quarter.
Two children were among those wounded.
The mass shooting showed again how far the city has to go to shake a persistent culture of violence that belies the city's festive image.
Gun violence has flared at two other city celebrations this year. Five people were wounded in a drive-by shooting in January after a Martin Luther King Jr. Day parade, and four were wounded in a shooting after an argument in the French Quarter in the days leading up to Mardi Gras. Two teens were arrested in connection with the MLK Day shootings; three men were arrested and charged in the Mardi Gras shootings.
The Associated Press contributed to this report.