At least 20 people were hurt on the "Son of Beast" roller coaster at Paramount's King's Island.
Authorities say most of the riders have minor chest and neck injuries.
A spokeswoman for the park says crews have shut down the Son of Beast roller coaster and are examining it.
The roller coaster is the tallest and fastest wooden coaster in the world.
It's more than seven-thousand feet long with a 214-foot hill and a 118-foot-high loop.
The cause of the accident is unknown at this time.
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