NEW ORLEANS, Louisiana -- One minute, a man stands at the outskirts of a packed parade route. The next, he charges toward them.
The scene is part of dramatic surveillance camera images of a shooting that turned a festive New Orleans Mother's Day parade into chaos and renewed concerns about crime in the city.
The images, released by police Monday, show the panicked crowd scrambling for cover. The man runs the other way, leaving scattered bicycles and bodies on the ground behind him.
It's the third holiday this year when guns have been fired into crowds, New Orleans Mayor Mitch Landrieu said. A January 21 shooting near a Martin Luther King Day parade left five wounded. Four people were hurt in a February Mardi Gras attack, the New Orleans Times-Picayune reported.
Sunday's shooting, which injured 19 people, sparked worries that despite the number of witnesses, no one will come forward. After years of corruption, a deep-seated distrust of police lingers among some of the city's residents.
Authorities vowed to catch the shooters.
"There were dozens of people in yesterday's second-line (parade). We know that there's still some of you who know information so please reconsider and let us know," Police Superintendent Ronal Serpas said Monday.
A $10,000 reward is being offered in the case.
Serpas said that police are still working to determine if there was more than one gunman, and whether there was more than one weapon on the scene. He said they were making "significant headway."
"I can assure whoever did this, we know a lot more about you than you think we do. And my recommendation to you is to collect yourself, and turn yourself in," Serpas said.
Remi Braden, a police spokeswoman, described the shooting as "an extremely unusual occurrence."
"We're confident that we will make swift arrests," she said, adding that members of the community have provided tips to authorities.
Witnesses were hard to come by Monday across the neighborhood, dotted with houses that have barred or boarded-up windows, overgrown lawns and patchy roads in need of paving.
A ripped T-shirt filled with bullet holes hung from a nearby light post, and a pair of old sneakers dangled from a power line.
Abdul Aziz, 33, told CNN's iReport that he saw a gun's muzzle flash at Sunday's parade but couldn't see who the shooter was.
"I'm sad. I love this city," he said. "We're plagued by crime, and it's just not getting better, no matter what we do."
The shooting took place at one of the city's famed second-line parades about two miles from the heart of the French Quarter. The dancing and brass band processions happen nearly every Sunday, except during the hottest months of summer.
The Original Big 7 Social Aid and Pleasure Club, which organized Sunday's parade, decried what it called a senseless attack.
"Secondlining is about community and celebration, not trauma and violence," the group said in a statement, describing crime and violence as systemic problems in the city.
"We feel embarrassed that the world is now viewing our city and our community through a lens of violence," the statement said. "We support a thorough investigation of the shooting and pray the perpetrators will be brought to justice."