This image provided by Logan Messerly shows ambulances on the scene at Canandaigua Motorsports Park on Saturday Aug. 9, 2014 in Canandaigua, N.Y. Authorities are investigating a serious crash that injured one person at a New York dirt track where Tony Stewart was racing on the eve of a NASCAR race. (AP Photo/Logan Messerly)
This image provided by Logan Messerly shows ambulances on the scene at Canandaigua Motorsports Park on Saturday Aug. 9, 2014 in Canandaigua, N.Y. Authorities are investigating a serious crash that injured one person at a New York dirt track where Tony Stewart was racing on the eve of a NASCAR race. (AP Photo/Logan Messerly)

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Sheriff: 'There's much work to be done'

Ontario County Sheriff Philip C. Povero says there is a lot of work to be done in the Tony Stewart crash investigation.

Sheriff: 'There's much work to be done'

Ontario County Sheriff Philip C. Povero says there is a lot of work to be done in the Tony Stewart crash investigation.