Upddated 8.12am

One person was killed and seven injured, three critically, at the Ohio State Fair on Wednesday when they were flung into the air after their seats snapped off a ride that hoists and spins people, police officials said.

The accident at the fair, which opened on Wednesday in Columbus, occurred when a section of open-air seating snapped off the "Fire Ball" ride, they said.

"It's a very tough day and a very tough night for the people of our state," Ohio Governor John Kasich told a news conference, describing the incident as a tragedy.

He said all fair rides had been shut for inspection.

The Fire Ball can hoist riders up to 12 metres in the air and spins them at 13 revolutions per minute, according to Amusements of America, an operator of amusement park rides.

The person killed was an 18-year-old man, fire officials told Ohio media.

None of the victims have been identified, although unconfimred reports said most of the injured were teenagers.

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