Authorities say 84-year-old Everett Cole's vehicle rolled above and hit a tree in front of a house in West Chester, about 15 miles north of Cincinnati.
Cole was aware and talked with emergency personnel as they extracted him from the car. There was no instant word on the extent of any injuries to him or others.
Police say three of the five wounded were taken to hospitals. One of the people struck was known as a Korean War veteran.
Cole had been allotted to drive a car in the parade Monday morning. The accident postponed the parade's start by 30 minutes.
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