(CNN) -- At least five people were being treated Thursday night at WakeMed hospital in Raleigh after an incident at the North Carolina State Fair, hospital spokeswoman Linda Fowler told CNN.
Jeffrey Hammerstein at Wake County EMS said one person had serious injuries. Another person had minor injuries, he said. He had no details on the condition of the other three victims.
CNN affiliate WRAL reported the accident involved a ride called the Vortex.
The rides at the fair -- about 100 total, according to its website -- are provided by Powers Great American Midways.
The New York-based carnival company describes the Vortex as one of its "spectacular" rides.
CNN's Joseph Netto contributed to this report.