Video has emerged of one of the men suspected of shooting dozens at an all-night cultural festival in Trenton, New Jersey, bleeding after being shot.

The shooting began around 2.45am at the 'Art All Night Trenton 2018' festival, a community cultural festival that showcases art, music and food.

One of the shooters, a 33-year-old man, is dead after he was shot and killed by police, according to the Mercer County Prosecutor's Office.

Both suspects were injured by the time police arrived, reported the Princeton Patch.

In the clip, one of the suspects is seen bleeding heavily and trying to roll on the ground. A second man is in police custody. Neither have been identified.

At least 22 people were injured at the event and four people are in critical condition, including a 13-year-old boy.

Video has emerged of one of the men suspected of shooting dozens at an all-night cultural festival in Trenton, New Jersey, bleeding after being shot (left and right)

The shooting began around 2.45am at the 'Art All Night Trenton 2018' festival, a community cultural festival that showcases art, music and food

The shooting did not appear to be a targeted event but rather a dispute that eventually led to an exchange of gunfire with police.

Edward Forchion, 55, told DailyMail.com that he was handing out flyers at the event when he heard an argument going on inside the building.

'One kid, about 30 [years old] was arguing with about four other guys saying that they hadn't take care of his sister and that she was lost,' he said.

'I don't know if that meant she was using - a drug addict. But he was saying that he was "away", I assume he meant in jail.'

'But he kept saying: "We're family, you take care of family".'

Officials have not confirmed if this is the same argument that led to the shooting.

The event began Saturday afternoon in the historic Roebling Wire Works building on South Clinton Avenue and was scheduled to continue through the night, ending on Sunday afternoon. It typically draws thousands of people.

The other suspect is currently in police custody. Neither has been identified by authorities

Police report that a 13-year-old boy and three other people are in critical condition

Forchion said he was by the back door of the building where the event was being held when he heard 10 shots ring out.

'About 20 to 30 feet away were police officers and they ran towards the door and then six more shots rang out, which I think was police firing back,' he said.

Reports say that of the 22 who were injured, 17 were being treated for gunshot wounds.

A 17-year-old was reportedly shot in the head, although the state of his or her condition remains unknown.

A spokeswoman for St Francis Medical Center in Trenton said 10 victims were being treated there for minor injuries.

She said they were both men and women, ranging in age from 17 to 48 and are in various stages of being released.

Angelo Nicolo told Philadelphia 6ABC station that he and his brother were at the event when they heard loud popping sounds. He said people started running down the street.

'I saw two police officers escort a guy that got shot in the leg, they bandaged him up and whisked him away,' Nicolo said.

It is believed that the shooting was not a targeted incident but a dispute that eventually led to an exchange of gunfire with police

A 17-year-old was also reportedly shot in the head, although the state of his or her condition remains unknown

At a press conference on Sunday morning, officials said there as many as 1,000 people in the immediate area of the shooting.

According to authorities, multiple individuals opened fire in the venue.

Two suspects have been identified by police. One is a 33-year-old man who was pronounced dead and the other was taken into police custody.

Multiple weapons have been recovered from the scene.

Forchion said he was by the back door of the building where the event was being held when he heard 10 shots ring out.

'About 20 to 30 feet away were police officers and they ran towards the door and then six more shots rang out, which I think was police firing back,' he said.