The U.S. Attorney's Office said it's looking at a company in Ohio and the Division of Highways Equipment Office in Upshur County.
A spokesperson confirmed Thursday that a federal search warrant was issued to MoTrim Incorporated in Cambridge Ohio.
Federal officials were at both locations this week to obtain records and documents.
No arrests have been made.
W.Va. Division of Highways Spokesperson Brent Walker said the DOH stands at the ready and continues to cooperate in the investigation.
MoTrim deals in selling boom mowers.
FBI agents and troopers from the West Virginia State Police descended on the Division of Highways Equipment Division complex, in Buckhannon, Tuesday afternoon.
They were there to serve a federal search warrant for records and documents, according to the U.S. Attorney for the Northern District of West Virginia's office. It's unclear what those records pertain to. A white box truck was seen leaving the complex with law enforcement vehicles.
FBI officials at the scene declined to comment. A representative with the U.S. Attorney's Office said that no arrests were made Tuesday. According to the W.Va. Department of Transportation's website, the Equipment Division handles equipment maintenance for the Division of Highways and other state agencies. West Virginia Division of Highways Spokesman Brent Walker said the DOH is aware of the investigation, but it isn't clear what is being investigated. "We don't know what they are looking for at this point. We're certainly cooperating with them," said Walker.
The division also takes care of fuel purchases for all state agencies, the website said. The complex is located at the intersection of U.S. Route 33 and Brushy Fork Road in Upshur County.
This is a developing story and will be updated as more information becomes available.