Police and ambulance workers stand over a woman or girl who was shot at a New Orleans block party the evening of Nov. 22, 2015. 
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At least 16 people were injured Sunday evening after a shooting in a crowded New Orleans park where hundreds had gathered to take part in a block party and music-video shoot.

According to the Associated Press, police arrived to break up the large crowd at Bunny Friend Playground in the 9th Ward just moments before gunfire erupted.

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Police don't have many clues as to what sparked the shooting, and New Orleans Mayor Mitch Landrieu is calling for witnesses to come forward.

"At the end of the day, it's really hard to police against a bunch of guys who decide to pull out guns and settle their disputes with 300 people in between them. That's just not something you can tolerate in the city," Landrieu said during a news conference.

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"It's going to require the people who were in this park to basically say they've had enough and they're not going to put themselves in harm's way, and give us information so that the police can do their job," he said.

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Investigators are using large stadium lights to flood the park while they collect evidence. Some reports note that as many as 500 people may have been in the park at the time of the shooting. Police Chief Michael Harrison told reporters that the event was primarily a block party and that some attendees took the moment to shoot a music video. Police spokesman Tyler Gamble told AP that neither the block party nor the music video had a permit to use the park.

Police told reporters that 10 injured people were taken from the scene by ambulance, while private vehicles transported six more people. Police noted that the condition of all the victims was stable.

Read more at the Associated Press.