"I tried to throw a block. It's Daytona, you want to go for the win here," Smith said. "I don't know how you can play it any different other than concede second place, and I wasn't willing to do that today. Our job is to put them in position to win, and it was, and it didn't work out."
As the cars began wrecking all around Smith and Keselowski, Stewart slid through for the win, but Larson plowed into Keselowski and his car was sent airborne into the fence. When Larson's car came to a stop, it was missing its entire front end. The 20-year-old, who made his Daytona debut this week, stood apparently stunned, hands on his hips, several feet away from his car, before finally making the mandatory trip to the care center.
He said his first thought was with the fans.
"I hope all the fans are OK and all the drivers are all right," Larson said. "I took a couple big hits there and saw my engine was gone. Just hope everybody's all right."
He said he was along for the ride in the last-lap accident.
"I was getting pushed from behind, I felt like, and by the time my spotter said lift or go low, it was too late," Larson said. "I was in the wreck and then felt like it was slowing down and I looked like I could see the ground. Had some flames come in the cockpit, but luckily I was all right and could get out of the car quick."
It appeared fans were lined right along the fence when Larson's car sailed up and into it, but Chitwood indicated there was a buffer. He said there would be no changes to the seating before the Daytona 500.
"We don't anticipate moving any of our fans," Chitwood said. "We had our safety protocols in place. Our security maintained a buffer that separates the fans from the fencing area. With the fencing being prepared tonight to our safety protocols, we expect to go racing tomorrow with no changes."
Larson's car appeared to hit where the cross-over gate — a section that can be opened for people to travel back and forth from the infield to the grandstands — is located in the fence. Previous accidents in which drivers hit crossover gates were severe, but the gates were in the wall and not the fence for Mike Harmon's accident at Bristol in 2002 and Michael Waltrip's at the same track in 1990.
Still, NASCAR senior vice president Steve O'Donnell said it would be studied.
"I think we look at this after every incident," O'Donnell said. "We've learned in the past certain protocols put in place today are a result of prior incidents. Again, our initial evaluation is still ongoing. But it's certainly something we'll look at. If we can improve upon it, we'll certainly put that in play as soon as we can."
Larson had been scheduled to race his sprint car later Saturday night in Ocala, Fla., and even seemed restless to get there during the late stages of the Nationwide race. He pulled out of the event following the accident.
"Honestly, the race itself pales in comparison to the injuries sustained by the fans," said Chip Ganassi, the team owner who has Larson in his driver development program. "Our thoughts and prayers go out to all the fans that were injured as a result of the crash. As for Kyle, I am very happy that he is OK."
Keselowski watched a replay of the final accident, and said his first thoughts were with the fans. As for the accident, he agreed he tried to make a winning move and Smith tried to block.
"He felt like that's what he had to do, and that's his right. The chaos comes with it," Keselowski said. "I made the move and he blocked it, and the two of us got together and started the chain events that caused that wreck. First and foremost, just want to make sure everyone in the stands is OK and we're thinking about them."
Keselowski said the incident could cast a pall on the Daytona 500.
"I think until we know exactly the statuses of everyone involved, it's hard to lock yourself into the 500," Keselowski said. "Hopefully, we'll know soon and hopefully everyone's OK. And if that's the case, we'll staring focusing on Sunday."
AP Sports Writers Dan Gelston and Jerome Minerva in Daytona Beach and Associated Press writer Jennifer Kay in Miami contributed to this report.