HOUSTON -- Four-time IndyCar Series champion Dario Franchitti was injured in a multicar accident near the end of Sunday's Grand Prix of Houston.
According to IndyCar medical director Dr. Michael Olinger, Franchitti was awake and alert at the scene. He was transported by ground to Memorial Hermann-Texas Medical Center, where it was determined he sustained a concussion, a spinal fracture that will not require surgery, and a fracture to his right ankle. He underwent surgery on the ankle.
A considerable amount of debris from the crash, including a wheel and tire assembly, flew toward a spectator area near Turn 5 of the 1.7-mile temporary track that winds through Reliant Park.
Houston Fire Department spokesman Ruy Lozano said at least 13 people were treated for minor injuries, with two transported to Memorial Hermann. One of those transported was IndyCar timing and scoring worker Kim Tyger, whose injuries were called "very minor" by the sanctioning organization.
Franchitti was running in 11th place, four spots behind Takuma Sato, when Sato's car lost grip and slid on Lap 88 of 90. Several cars got past the Japanese driver, but he veered into the path of a fast-closing Franchitti, whose car was launched into the steel catch fence that lines the course.
The accident occurred at one of the fastest parts of the Houston course, on a blind right-hand bend that leads into a favored passing zone at Turn 6.
Franchitti's car shredded a large section of fencing as it spun airborne before landing on the track. E.J. Viso's car was also swept into the accident.
"He's talking," Franchitti team owner Chip Ganassi said in an interview with NBC Sports Network. "His ankle is a little sore and his back is a little sore.
"He's gonna take a trip to the hospital, that's for sure. But he's OK."
Target Chip Ganassi Racing said Monday that Franchitti will remain in Houston for a few days and then be taken to Indianapolis for further evaluation. The team also said Franchitti thanked his fans for their support.
Dixon's second-place finish gave him a 25-point lead in the IndyCar Series standings heading to the Oct. 19 season finale at Fontana, Calif. Helio Castroneves, who entered Sunday's race as the points leader, suffered gearbox problems and finished 23rd.
"I'm concerned for the fans," Dixon said of the wreck. "It looks like the fence took a pretty good hit there, and I hope nobody in the stands got hurt.
"It looked like [Franchitti] was moving around when I went by. I tried waving to him. He didn't wave back, but I'm sure he was focused on some other things there. All in all, I hope he's OK."
After driving through the crash scene at reduced speed behind the pace car on the final lap, Dixon said he was reminded to a lesser extent of Dan Wheldon's fatal crash two years ago at Las Vegas Motor Speedway.
"It's the smells and the visuals," Dixon said. "You have the remnants of Vegas popping into your head, coming around the corner, and you can't drive through it because there's a field of debris. There was nowhere near the amount of damage that we saw a few years back, but seeing the replay, I think, was the big shock.
"When I was driving around, I didn't even look at the fence. To see Dario's car definitely brings home what we do each weekend and the difficulties that we can have out there. It's not a good sight to see, that's for sure."
Information from The Associated Press was used in this report.