Hinchcliffe, cleared to drive last weekend after suffering a concussion two weeks ago in the Grand Prix of Indianapolis, accepted responsibility.
“I was the last guy on the scene,” he said. “I have to take the blame, for sure. I feel really bad for [Carpenter] because he had a great month and was doing a great job.”
Former race winner Scott Dixon, who took downforce out of the car, brought out the second caution flag on lap 168 making contact with the turn four wall.
Bell brought out the final caution flag on lap 193 when he crashed in turn two while running sixth. Speedway officials threw the red flag to make repairs to the safer barrier — and the stage was set for the thrilling finish.
Defending race winner Tony Kanaan worked his way to the front from the 16th starting spot ran out of fuel before his second pit stop on lap 64 and while on pit road stripped the gears in the starter, ending his bid for the victory.
The Associated Press contributed to this story.