NEW ORLEANS — At least 16 people were injured, 10 of them hospitalized, after a shootout on Sunday night in a park here where hundreds of people had gathered for the filming of a music video, the New Orleans Police Department said.

In addition to the 10 people who were taken to hospitals by ambulances, officials said that others were showing up with injuries they said were related to the shooting.

The police said 16 people were injured, and they issued an urgent appeal for information. “This is a classic case where we need citizens’ help,” Superintendent Michael S. Harrison of the police told reporters at a briefing. “What we need more than anything else is for witnesses to come forward and tell us what they saw.”

Mayor Mitch Landrieu, who joined Superintendent Harrison at the briefing, called the violence “infuriating,” adding, “It’s just insane to put the lives of this many innocent people at risk.”