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A mass shooting at a festival has left at least one person dead and at least 14 others injured.

Petrified revellers ran for their lives from the Art All Night as shots were fired sparking total chaos.

Emergency services raced to the scene in Trenton, New Jersey where people had either been shot or injured from the mass stampede, the Mirror reports .

Eyewitnesses told how "all hell broke loose" when at least one gunman opened fire as people squared up to fight just before 3am local time.

Off-duty police who were nearby returned gunfire as the shooter or shooters ran out of the building with everyone else.

(Image: ABC)

One suspect - a 33-year-old man - was killed, a second is in police custody and four people, including a 13-year-old boy, are fighting for their lives in hospital.

Angelo Nicolo told ABC6: "All of a sudden, my brother goes to me, 'You hear that gunfire?' I go, 'It sounds like fireworks'.

"He said, 'No, that's gunfire'. Next thing you know, we turn around and everybody's running down the street.

"All hell broke loose."

Mr Nicolo said he saw a man who had been shot in the leg and was rushed to hospital by police before an ambulance arrived.

(Image: ABC)

Festivalgoer Franco Roberts told the Trentonian newspaper that he arrived with his girlfriend shortly before the shooting and immediately had a bad feeling.

He likened it to a scene outside a nightclub, with people lingering around their cars smoking and drinking.

There were more people outside than inside, he said, and no music was being played inside the warehouse.

Mr Roberts added: “Someone told us they were shutting down the whole building. Then we turned around and saw people squaring up to fight.

“I saw two punches and then heard several gunshots."

(Image: ABC)

He said: "Everybody ran toward the door. And the people fighting and shooting got mixed with the crowd that was running and they went out the door shooting.”

Mr Robers told the newspaper he didn't know how many people were shooting, but it sounded like there was more than one.

The 24-hour event was being held at the Roebling Wire Works Building in Trenton, the state capital.

It is intended to showcase local artists and musicians, and was due to run from 3pm on Saturday to 3pm on Sunday.

There have been 129 mass shootings in the US so far in 2018, according to the website Gun Violence Archive.