Another search warrant has been executed on the headquarters of the truckstop chain Pilot Flying J.

The Knoxville News Sentinel reports it spoke with U.S. Attorney Bill Killian, who would only say it was served last night. No arrests have been made since the first warrant was served Monday in a raid by both FBI and IRS agents. The more than 600 locations of the Knoxville, Tenn.-based Pilot Flying J have remained open since then.

Tennessee Gov. Bill Haslem, brother of Pilot Fying J CEO Jimmy Haslem and former president of the company, spoke to reporters earlier Tuesday about the raids.

"Obviously when something like this happens, there's gossip and suspicion about what happened, and the truth is nobody knows," Gov. Haslam said. "I don't know either. I don't really know any more of the facts than what you do."

He said he has not talked with authorities about the investigation. He told reporters that he has not been involved in the business in more than a decade, though he still remains a company shareholder. The Nashville Scene also published a transcript of the interview.

It could be a while before the reasons about the raids and the investigation are made public. FBI spokesman Marshall Stone told the The Associated Press that the move was part of an ongoing investigation and "any details that would be released to the public would not be available for some time.”

In a post on its website, the company said Pilot Flying J employees were expected to report to work at the company's headquarters today as usual.