The FBI is involved in a multi-year investigation in the Wichita area.
Wichita Mayor Jeff Longwell confirmed the investigation has been going on for at least two years.
"It could be longer, but that's certainly a conservative time frame," Longwell said.
Longwell said he could not comment on how or when he found out about the investigation because it is ongoing.
The FBI would not confirm or deny the investigation, but spokeswoman Bridget Patton said that agents were in Wichita last week.