A spokesman for the parent company of the Ringling Bros. Barnum and Bailey Circus says the prognosis of eight acrobats who fell during an aerial performance hasn't been determined yet, but they're hopeful they will return to the show.

Stephen Payne says the women suffered a number of broken bones and other injuries consistent with a nine-metre fall during Sunday's accident in Rhode Island.

Providence Public Safety Commissioner Steven Pare told WPRO-AM on Monday that a clamp for the rigging that held the women to the rafters snapped.

Circus Accident

Performers hang during an aerial hair-hanging stunt at the Ringling Brothers and Barnum and Bailey Circus, Friday, in Providence, R.I. A platform collapsed during the stunt at the 11 a.m. performance Sunday. (Frank Caprio/The Associated Press)

Payne says it's premature to attribute the accident to a particular clamp, and an investigation is ongoing.

He says the rigging was inspected by a circus crew when it was installed last week. He didn't know whether it was inspected after that.

Authorities were trying to determine Monday what caused a support frame to collapse during the aerial hair-hanging stunt during a circus performance in Providence, sending eight acrobats crashing to the ground and onto a dancer below. At least three remained in critical condition Monday morning, hospital officials said.

The accident occurred Sunday during the Ringling Bros. and Barnum and Bailey "Legends" show during an act in which the circus says eight performers hang "like a human chandelier" using their hair.

Eight of the injured were members of the circus' Medeiros troupe, and are from the United States, Brazil, Bulgaria and Ukraine, according to the circus' website.

Children in audience

A spokeswoman for Rhode Island Hospital said performers Dayana Costa, Julissa Segrera and Stefany Neves were in critical condition Monday morning. Viktoriya Medeiros and Viktorila Liakhova were listed in serious condition, while Samantha Pitard, Svitlana Balanicheva and Widny Nevas were listed in good condition.

The names and conditions of three others injured in the accident had not been released.

The accident was reported about 45 minutes into the circus's 11 a.m. performance at the Dunkin' Donuts Center. It was witnessed by an audience of about 3,900, many of them children.

Stephen Payne, a spokesman for Feld Entertainment, the parent company of Ringling Bros., said the metal-frame apparatus from which the performers were hanging came free from the metal truss to which it was connected. The eight women fell 7½ to 12 metres, landing on the dancer below.

Providence Public Safety Commissioner Steven Pare said officials and inspectors haven't yet determined what caused the accident. He said none of the injuries appears to be life-threatening.

Investigators from the federal Occupational Safety and Health Administration also were to investigate the accident.

Roman Garcia, general manager of the Legends show, asked people to pray for the performers.

"Everybody's doing fine, everybody's at the hospital, everybody's conscious, everybody's doing pretty well," he said at the Dunkin' Donuts Center less than two hours after the accident.

The hair-hanging stunt is described on the circus' website as a "larger-than-life act" featuring eight female performers.

Ringling Brothers and Barnum and Bailey Circus injury

An injured female performer is lifted onto a stretcher after a platform collapsed during an aerial hair-hanging stunt at the Ringling Brothers and Barnum and Bailey Circus, Sunday. (Bob Breidenbach/Providence Journal, Associated Press)

Payne said all the performers have been doing "some variation of this act for some time," though he didn't know how long. The current incarnation of the act began in January with the launch of the show, and performers have been doing it a dozen times a week since, he said.

"These `hairialists' perform a combination of choreography and cut-ups including spinning, hanging from hoops, and rolling down wrapped silks, all while being suspended 35 feet in the air by their hair alone," the website says. "In this hair-raising act, audiences will even see the weight of three girls held aloft by the locks of only one of these tangled beauties."

Video taken by audience members shows a curtain dropping to reveal several performers hanging from an apparatus suspended from above. Seconds later, as they begin to perform, the women fall, and the metal apparatus lands on them.

Lights went out

"It just went crashing down," said audience member Sydney Bragg, 14, of North Kingstown. "Everyone was freaking out. We heard this huge clatter and then we just heard the girls scream."

She said spotlights were on the performers at the time, but all the lights went out after the fall.

Rosa Viveiros of Seekonk, Massachusetts, said she saw that the acrobats had fallen on top of at least one other performer below, a man who stood up with his face bloodied. The acrobats remained still and did not get up, she said.

"We thought it was part of the circus," said her husband, Joe.

The couple attended the circus with their six-year-old grandson and nine-year-old niece.

"Everyone was in shock," Rosa Viveiros said. "It was pretty overwhelming to see that."

The circus began performances in Providence on Friday. Monday's shows were cancelled, as were two on Sunday.

Payne said the circus was working with federal and local officials to find out what went wrong and correct any problems that might exist.

"We want to make sure all of our performers are safe," he said Monday. "An accident like this is unprecedented involving this number of performers. We're just grateful that as of now, none of the injuries appear to be life-threatening.

Payne said Kenneth Feld, the chief executive of Feld Entertainment, and his daughter Nicole, a circus producer, flew to Providence on Sunday night and was at the hospital visiting with the performers.

A Ringling Bros. aerial performer was killed in 2004 in St. Paul, Minnesota, when she was twirling nine metres in the air on long chiffon scarves and the material gave way.

Warning: Graphic video