The truck that sprayed metal chunks into the crowd is seen moments before the accident. (Image submitted by KOMO News viewer Krystal)

The Pierce County Medical Examiner identified the boy as Sabastian Hizey of Puyallup, Wash.

Medics treat one of the victims at the accident scene Friday night in the Tacoma Dome. (Photo by KOMO News viewer Ashlee Foltz)

Witnesses said one of the trucks was driving in circles, and a spray of metal pieces came off of the truck and flew over a safety barrier. The pieces knocked the man off of his feet and hit the boy in the head, causing them to bleed and creating a rather gruesome scene.

• YouNews video of the monster truck

"It was just a horrendous scene," said witness Gabe Mausten. "It was very disturbing scene."

The injured pair have been taken to an area hospital, fire officials said. The boy later was declared dead by the Pierce County Medical Examiner's Office.

After the boy was hit, witnesses said a man in shock rose up from his seat and began yelling, "My kid is dead! My kid is dead!"

Witnesses said after the accident, people began leaving in droves but event organizers continued on with the show.

"It was kind of angering a lot of people that they didn't even stop the show," Mausten said.

Witnesses said some people in the crowd began throwing beer and glass containers at the truck from which the debris was believed to have come.

Organizers of the show, who refused to answer questions about Friday night's incident, released a brief statement.

"Our company follows strict safety guidelines designated to protect both spectator and competitors alike," said Bill Easterly, Monster Jam's senior director of operations, in a statement.

The city of Tacoma released the following statement about the accident on Saturday afternoon:

"The City of Tacoma and Tacoma Dome staff are deeply saddened and our hearts go out to the families of the child who died and to the man who was injured from the accident at last night's Monster Jam event.

"The Tacoma Dome takes the safety of its customers very seriously, and we are working with Feld Motor Sports, the promoters of Monster Jam, to investigate the accident and ensure the safety of guests at the remaining shows this weekend," the statement added.

There were four more Monster Jam shows scheduled at the Tacoma Dome this weekend. The shows have not been canceled, but anyone with tickets who doesn't want to attend can apply for a refund by calling Ticketmaster at 866-448-7849.