|Several people were thrown from the ride|
The accident took place on the Fire Ball ride, on the opening day of the Ohio State Fair.
A graphic video circulated on Twitter shows the ride swinging from side to side before parts of it appear to break off, hurling passengers through the air.
Three of the injured remain in a critical condition in hospital.
A Columbus fire official CBS's local affiliate that the man killed was 18 and that the seven people injured ranged in age from 13 to 41.
The incident has prompted scrutiny over safety practices at the fair. Ride inspectors said the Fire Ball had been inspected more than once and signed off on Wednesday.
|People at the scene of the tragedy.|
He has ordered that all fair rides be shut down as investigations are completed.
"The fair is about the best things in life, and tonight with this accident it becomes a terrible, terrible tragedy," he said at a news conference late on Wednesday night.
The Ohio State Fair said in a Twitter statement: "Our hearts are heavy for the families of those involved in last night's tragic accident. We have shut down all rides until the state has inspected each and every ride again and deemed them to be safe."
Our hearts are heavy...6:24 AM - Jul 27, 2017181 209 Ohio State Fair@OhioStateFairMichael Vartorella, chief inspector of amusement ride safety for the Agriculture Department, said the Fire Ball ride was inspected at least three times before the fair started.He said four rides were not allowed to operate but he told the Columbus Dispatch there were "no guarantees" as there could be structural weaknesses that could not be seen by the human eye.
The website of a company providing rides to the Ohio State Fair described the Fire Ball as an "aggressive thrill" ride that spins riders at 13 revolutions per minute, swinging 40ft (12m) above the midway.
The company, Amusements of America, described the Fire Ball as "one of the most popular thrill rides".
The company did not initially respond to a message requesting comment.
The fair is set to run until 6 August.