6ABC-TV cited local officials as saying that the incident was an officer-involved shooting.
About 20 people are injured, a lot of them with gunshot wounds.
Three out of four people admitted to hospital in critical conditions, including the teen, had their conditions upgraded to stable.
People pushed and shoved one another. He has yet to be fully interviewed, Onofri said. The suspect who has been killed was a 32-year-old man, identified as Tahaij Wells.
Authorities said Wells was carrying a handgun with an extended magazine - a gun that's illegal to possess in New Jersey. Another suspect, age and identity unknown, was taken into custody. How many shots were fired in all is still under investigation, they said. "During that time period, prior to the shooting, the Trenton Police Department began dispersing individuals". "Everybody was having a nice time".
"The next thing you know, there were gunshots, got shot in the leg, fell on the ground, and that was it". "All hell broke loose", Angelo Nicolo told WPVI.
Angelo Nicolo, who was with his brother at the event, said he heard loud popping sounds and saw attendees running down the street. "It was pretty gnarly". Trenton fire crews as well as medics, including some from Bucks County, have been called to the area.
"We have historically brought in upward of collectively 10,000 people with no problems and this year, people came and obviously had other intentions that made it now really disruptive and unfortunate event", Jackson said.
"A kind woman pulled me up and over to the side and told me to stay down with her", Knapp wrote. The vehicle was damaged, but it's not known if this was related to the shooting or not.
Art All Night is an annual event held in June.
Gennie Darisme was getting ready to leave the festival when she heard shots and saw people running. In a post shared to their Facebook page, organizers said they are still processing the event, but that it appears that all of the staff, volunteers, artists and musicians were accounted for and healthy. "Our honest, heartfelt sympathies are with those who were injured", the post read. We're still trying ourselves to piece this entire situation together.
"Someone told us they were shutting down the whole building".
This report will be updated as more information comes in.