Franklin County Sheriff’s officers Thursday morning said an alleged sexual assault reported Monday night on Interstate 35 was a hoax.

Officers said they re-interviewed a 14-year-old Kansas City, Mo., boy who made the initial allegation that he was assaulted by a stranger who picked him up as he was walking to a gasoline station east of Ottawa. The boy had initially told authorities that his family had car trouble and that he was walking to a nearby service station for help.

“The alleged victim confessed to making up the report. It is unknown at this time why the boy made up the story,” Undersheriff Steve Lunger said in a statement.

Officers Tuesday even released a description the suspect the boy had given them and asked anyone with information in the case to call investigators. Lunger’s statement to the media Thursday morning about the hoax did not say if the boy would face any criminal charges for making the false report.