JUDY WOODRUFF:

On the eve of the opening Olympic ceremonies in Brazil, a new investigation into USA Gymnastics uncovers some disturbing details.

As athletes are gathering in Rio, a stunning report from The Indianapolis Star and USA Today Network dominated this day: It found top executives in charge of gymnastics' national governing body for years routinely ignored allegations of sexual abuse by coaches of young athletes, in some cases going back to the 1990s.

The report said USA Gymnastics had files on more than 50 coaches around the country, claims that had long sat in drawers at its office in Indianapolis. That included a former coach, Mark Schiefelbein. The news report said gymnastics officials had a thick file of complaints about him for years before he was convicted of sexual battery and sexual exploitation of a minor.

Former gymnast Becca Seaborn says he molested her as a young girl. Her parents learned of the extensive file USA Olympics had only after he was convicted.

JILL ROBINSON, Parent of Sexual Abuse Survivor : Our daughter now is 26 years old. This happened when she was 10 and 11. And for it still to be where it's at and for them not to have changed anything, it just makes me sick that this is still happening, that these children aren't being protected. And it's just not fair.

The Olympics is going to start. These kids are going to want to go jump in gyms and be just like these heroes they see on TV, and it just starts all over again. And it just makes me really sad.