Police tape ropes off a chaotic scene where 1 person was killed at Art All Night in Trenton.  Photo from The Trenton Post.

A deadly shooting broke out around 3 am at the Art All Night Festival in Trenton sending people stampeding from the scene and leaving one suspect dead and 20 people injured.

The Mercer County prosecutor’s office said at a Sunday morning press conference that the one person killed, a 33-year-old man, is a suspect in the shooting. Another suspect is in custody.

Of those injured, 16 were treated for gunshot wounds and four for other types of injuries, said Mercer County Prosecutor Angelo Onofri.

Multiple people opened fire in the shooting and multiple weapons have been recovered, authorities said.

“It absolutely could have been worse given the confined space and the number of shots that appeared to have been fired,,” Onofri said. “We’ve heard estimates ranging from 1,000 and up people there.”

Art All Night Trenton began Saturday afternoon and was scheduled to conclude Sunday afternoon.

The remainder of the festival has been canceled.

“We’re very shocked. We’re deeply saddened. Our hearts ache and our eyes are blurry but our dedication and resolve to building a better Trenton through community, creativity and inspiration will never fade. Not tonight. Not ever,” festival organizers posted on social media Sunday.