Checked in at IndyCar.com to see what was going on in Iowa, and the live video is showing a group of men standing in 1 of the turns with leaf blowers, several track officials, and one of the track vacuum trucks. There's no sound, so I'm only guessing that there's water seeping up onto the track surface.
Also, from the "No Big Surprise Department", Marco Andretti crashed in practice and Danica thumped 1 of her crewmen with the left front tire when pulling into the pits...
