ST. LOUIS (KSDK) - There are 30,000 people in St. Louis for the 2013 First Robotics World Championship.

The event pits robots, built by teen students, against one another in various sports.

PHOTOS:International robotics competition

This year's competition started Wednesday and runs through Saturday at the America's center and Edward Jones Dome.

Click the video player above to watch Grant Bissell's report.