New Orleans police released a surveillance video of one of at least three suspects wanted in connection with Sunday's Mother's Day parade shooting.
No one was killed, but 19 people were shot in the incident.
In the footage posted to YouTube, a male wearing a white t-shirt and dark pants can be seen standing on the side of a street in the city's 7th Ward.
The man appears to open fire on the crowd, then flees.
Police believe shots were fired from different guns, and three suspects are wanted by police after being seen by officers running away from the scene.
Police say most of the victims - 10 adult males, 7 adult females, a 10-year-old boy and a 10-year-old girl - were grazed by gunfire in the attack.
The 10-year-olds "had graze wounds to the body and are in good condition."
Most of the wounds sustained were not life-threatening. Three victims arrived at the hospital in critical condition and underwent immediate surgery.
New Orleans and federal officials are offering a $10,000 reward for information leading to "the arrest and indictment of the person(s) responsible."
Police also warned that anyone withholding information or helping "harbor, conceal, or aid the offender" could be charged as an accessory as well.