Nascar Race today where many spectators were injured

A person in the stands caught this video.  Notice the tire at the end.  28 people were hurt.  No drivers were hurt.

https://www.youtube.com/watch?v=w4vW8r8H_DE&feature=player_embedded

This talks about the injuries.

http://www.rawstory.com/rs/2013/02/23/28-people-injured-after-crash-in-final-lap-of-nascar-event/