Marty Smith just said on Twitter that the cops told him he had to leave the grandstand or he'd be thrown in jail.

At least six fans sustained injuries when parts of Kyle Larson's car flew into the stands at the conclusion of Saturday's Nationwide Series race at Daytona International Speedway.
A track worker told Yahoo! Sports that one woman had a tourniquet on her leg, others suffered burns and a tire landed on one fan when a multiple-car accident unfolded as drivers raced for the finish line in the final lap of the Drive4COPD 300.
Tony Stewart missed the pileup and won the race as Larson's car was propelled into the catchfence separating the track from the grandstands on the Daytona International Speedway trioval.
The crash was triggered when leader Regan Smith was turned via contact from Brad Keselowski, who was pushing him. Much like many crashes that have happened in the front of the field at Daytona, the wreck was unavoidable for many behind and Larson's car was catapulted into the catchfence after he was tagged from behind. The impact with the catchfence sheared the entire front off of Larson's car and his engine and a tire ended up lodged in the catchfence with the other tire nine rows up in the grandstands. When Larson's car came to rest in the infield, the entire section of the car in front of the cockpit was missing.
After the crash, spectators were being treated in the grandstands for injuries from debris from the crash. We will update the post when more information becomes available. Larson was evaluated and released from the infield care center after he climbed from his car. Following the race, NASCAR President Mike Helton joined ESPN in the booth.
"I think to see and explain what we know right now is there obviously was some intrusion into the fence, and fortunately with the way the event's equipped up, there was plenty of emergency workers ready to go. They all jumped in on it pretty quickly," Helton said.
"Right now it's a function of trying to determine of what all damage is done. They're moving folks as we've seen to care centers and taking some folks over to Halifax Medical Center. We'll be able to update you later on, but all we know is everybody is working hard on what all happened.
To get in position to win, Stewart made an aggressive move on the backstretch on the final lap to move from the inside lane to the outside with Sam Hornish pushing him and the two made up ground on Smith and Keselowski in turns 3 and 4. As Smith's car spun around, Stewart darted to the inside and avoided both drivers to take the win.
Earlier in the race, another multi-car accident erupted. It involved Michael Annett, who was taken to an area hospital. He was awake, alert and undergoing tests, according to NASCAR.

usa today's website has some pictures of the injured fans. saw a guy on a stretcher with a brace on his right leg, blood running down to his ankle.

Jeff Gluck ‏@jeff_gluck

Update from Daytona: Grandstands now cleared of injured people. Five fans were removed on backboards that I saw, maybe more.