Problems for truckstop operator Pilot Flying J and CEO Jimmy Haslam show no signs of letting up.

A federal grand jury is looking into possible indictments, according to WEWS-TV in Cleveland, Ohio, following an raid on company headquarters on April 15 by federal agents looking into allegations the company shortchanged some customers on money there were owned in the form of rebates from fuel purchases.

A spokesman for the U.S. Attorney’s office would neither deny or confirm such activity.

So far five Pilot Flying J employees have pleaded guilty for their roles, while Haslam has denied any wrongdoing. Two others have reportedly been granted immunity by federal authorities.

The revelation comes as more lawsuits have been filed against Pilot Flying J, taking the count up to at least 20 since mid-April, with most of them being class actions.

One of the latest involves Alabama-based Wright Transportation, which has about 120 drivers. The case was filed in federal court in Mobile, Ala., naming Haslam and several other company officials as defendants.

Wright Transportation claims it was hurt by Pilot Flying J efforts to “secretly and unlawfully withhold diesel fuel price rebates and/or discounts” and that Haslam gave his “blessing” to the plan to allegedly bilk its customers.

Shortly before this suit was filed, attorneys for New Hampshire owner-operator Fred Woodward filed a federal lawsuit against Pilot Flying J in his home state. It is also a class action.