Jeff Olson and Nate Ryan, USA TODAY Sports
Houston -- Dario Franchitti's car went airborne into the catchfence on the final lap of the Grand Prix of Houston in a three-car crash that also collected E.J. Viso and Takuma Sato.
Franchitti stayed in the tub of his Chip Ganassi Racing car a lengthy time as Viso and Sato eventually climbed from theirs and walked away.
Race officials and safety workers tended to Franchitti until an ambulance arrived.
Franchitti was awake and alert and complaining of back and ankle pain after the crash on a temporary street circuit in Reliant Park.
Team owner Ganassi said on TV the four-time IndyCar champion was OK.
"He's talking. His ankle is a little sore. His back is a little sore. He's going to take a trip to the hospital, but he is OK," Ganassi said.
The wreck vaulted pieces of the car and catchfence into stands where fans were sitting.
IndyCar PR representative Amy Konrath said an update on the injured fans would be forthcoming.
Several IndyCar drivers took to Twitter to send well-wishes to Franchitti and injured fans. Graham Rahal, who finished 18th, said the crash was "flat out scary."