A treacherous finale to a race at the daytona international speedway. Cars colliding, getting tossed around like toys. Pieces of cars flying over a fence, injuring at least a dozen people, many of... See More
A treacherous finale to a race at the daytona international speedway. Cars colliding, getting tossed around like toys. Pieces of cars flying over a fence, injuring at least a dozen people, many of them fans. Abc's linzie janis on the story. Reporter: One driver sparked a dramatic crash on the daytona track. And contact! And a terrible crash coming to finish. Reporter: Sending his car spinning into the wall and another going airborne. Parts of the 12 cars involved in the crash, slide through the fence, into the stands, hitting and injuring spectators. So far, 15 people have been taken to the hospital. The drivers are all okay. Now, take a look again. The driver out front is regan smith, he tries to prevent his opponent, the car directly behind him, from trying to break out in front. Triggering the giant crash, sending the car of kyle larson into the air, ripping its engine off. hurtling towards the screaming fans. I made the move. Started the chain of events that caused that wreck. I hope everyone is in the stands is okay. They started wrecking in front of us. From that point it was too late. You're running so fast. Reporter: It's a dark day for nascar when fans get injured. Tomorrow is the big race, the daytona 500, many of those same drivers will be competing again in just a few hours. Dan? Back to this crash, one car triggered the whole thing. That's right. The car out in front, tries to block his opponent immediately behind him from getting out in front of him. That sparked the big crash. You can see the car that goes airborne, kyle larson, its engine got completely ripped off, that went into the stands. You can see it burning there. It wedged itself in a hole in the fence. This is why we have some very serious injuries, six of these patients will be trauma patients. Linzie, lot of people will want to know about danica patrick, she'll be starting in pole position, was she involved here. She was not involved. She actually had to bow out of the race earlier on because of some engine troubles. There will be a lot of people relieved to that. We head overseas to another
This transcript has been automatically generated and may not be 100% accurate.