(CNN) -- Seven of the nine circus performers injured over the weekend during a show remain hospitalized at Rhode Island Hospital, the facility's president said Wednesday.
Four are in serious condition and three are in good condition. Two patients have already been discharged, the hospital president, Dr. Timothy J. Babineau, said.
The incident occurred during a Ringling Bros. and Barnum & Bailey performance in Providence, Rhode Island. It was caused by a 5-inch D-ring that snapped, the lead investigator for the city's fire department said Monday.
The D-ring was part of a rig designed to hoist performers by their hair into the air above the audience, where they would perform acrobatics. When it snapped, the rig and the performers fell to the ground.