Ryan Briscoe's race ended when he hit the wall exiting a turn on lap 22, and Josef Newgarden was involved in an accident at chicane on a restart on lap 29.
Rubens Barrichello, in his first race at home since joining IndyCar this season after a 19-year career in Formula One, ran as high as third place but fell to 10th at the end.
"Unfortunately, because of all the caution flags our strategy didn't work out today, but it will some other day," he said.
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