Gerald Herbert / AP
Louisiana State Police stand near the 400 block of Bourbon Street in the French Quarter in New Orleans, Feb. 10, 2013. Police said late Saturday two males and two females were shot, and the most severely wounded man was undergoing surgery while the others were stable.
This frame grab of a bystander's video provided by the New Orleans Police Department shows one of the suspects, left, that police say they are seeking.
Three of the victims were listed in stable condition while a male victim underwent surgery and was listed in critical condition, New Orleans Police spokesman Frank Robertson said.
The shooting happened at around 9:30 p.m. (10:30 p.m. ET) after one of the victims got into an argument with two men, Robertson said. The two men left but soon returned, according to police.
One then shot one of the victims in the abdomen, upper thigh and pelvic area, and fled the scene, Robertson said.
-- Reported by F. Brinley Bruton, Staff Writer, NBC News
Four people were shot during the annual Mardi Gras festivities on New Orleans' Bourbon Street. But even as police cleared the scene, thousands kept on with the party. TODAY's Jenna Wolfe reports.