The Missing Children Incident was an event that occurred at Freddy Fazbear's Pizza, and is mentioned in the first, second, and third games. 

In the first game, numerous newspaper clippings can occasionally be seen replacing the Rules for Safety sign, normally appearing in the East Hall Corner. These clippings explain that during late June of an unspecified year, a total of five children had gradually gone missing at the pizzeria. 

Police suspect that a man had dressed up in a costume resembling one of the animatronics, possibly Golden Freddy's or Springtrap's, as implied on Night 6's phone call in the second game, and lured the children to a back room, where he murdered them. 

Soon after the incident, the company's animatronics had begun to leak blood and mucus around the facial areas and had released a foul odor likened by a parent as "reanimated carcasses". This has led to the popular belief that the murdered children were stuffed into the animatronic suits. This incident, along with other incidents and health violations, ultimately led to the closing of the pizzeria, and it was set to shut down by year's end.