four of them seriously. racing officials advise spectators to stand at least 100 feet away from the crash course. clearly, many people were not heeding that advice. drivers must sign waivers absolving officials of any responsibility if they are hurt or kill. spectators attend at their own risk. the young man who captured the tragic event on video, he tells cnn he had his own close call just moments earlier. >> about two minutes before i started filming, there was a close call with myself and my friends on the left side where i was filming. and i actually was a lot closer than what it shows on the video, and i got pushed back. you know, i got shaken up. i said, man, that was close. and that's when i decided to film what was going on and that's the only video i have of the whole race was just that -- the crash. and it's very unfortunate what