Nine performers were seriously hurt during yesterday's performance by Ringling Bros and Barnum and Bailey Circus in Rhode Island, including a dancer below. Several others suffered less serious injuries.
The accident occurred during the Legends show in which the circus says eight performers hang "like a human chandelier" using their hair.
Providence Public Safety Commissioner Steven Pare said officials and inspectors haven't yet determined what caused the accident.
It was witnessed by an audience of about 3,900, many of them children.
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Pare said none of the injuries appears to be life-threatening. 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 less than two hours after the accident.
Rhode Island Hospital in Providence admitted 11 patients with varying injuries, including one in critical condition, spokeswoman Jill Reuter 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 10.6 metres 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 showed a curtain coming down, and several performers hanging around 7.6 metres in the air from an apparatus suspended from above. Seconds later, as they began to perform, the women fell and the metal apparatus landed on them.
A Ringling Bros aerial performer was killed in 2004 in Minnesota when she was twirling 9 metres in the air on long chiffon scarves and the material gave way.