NASHVILLE (AP) — More than a year after FBI agents raided the Tennessee headquarters of the huge truck-stop chain owned by the Cleveland Browns' owner and Tennessee's governor, Pilot Flying J is cleaning house.

Several top executives, including the president, abruptly left this week.

Some observers say the departures could indicate that prosecutors are preparing to charge the company, or top management, or both. But others say it's impossible to tell from the outside why managers are leaving the privately held company. And Pilot representatives say not to read too much into the changes.

Ten former employees have previously pleaded guilty to cheating trucking companies.

Pilot CEO and Browns owner Jimmy Haslam has said he had no knowledge of the scheme. Tennessee Gov. Bill Haslam is not involved in Pilot's operations.