INDIANAPOLIS (WOWO): With the Brickyard 400 a few days away, state officials are stepping up efforts to target sex trafficking:

Officials made door-to-door visits to Speedway businesses posting fliers urging victims of sex trafficking to call a state helpline, and urging everyone to call authorities if they see early-teens who seem unusually fearful and under an adult's control.

Indianapolis Representative Christina Hale says big sporting events draw a spike in prostitution rings — Indy made 18 arrests during April's Final Four, and saw a noticeable increase in Internet traffic promoting the sex trade.