As the potential sale of the Washington Commanders inches forward, a federal investigation into the franchise continues as well.

The U.S. Attorney’s Office of Eastern Virginia opened an investigation into the team last year over financial irregularities first reported by Front Office Sports. The case remains open, and at least one subpoena has been issued as part of the probe, two sources with knowledge of the inquiry told FOS.

“The team has been fully cooperating with the Eastern District of Virginia since it received a request for records last year,” Commanders counsel John Brownlee said in a statement to FOS. “The requested records only relate to customer security deposits and the team’s ticket sales and revenue. The team will continue to cooperate with this investigation.”

A spokesperson for the U.S. Attorney’s Office of Eastern Virginia declined comment.

While it’s unclear the full scope of the investigation, the House Oversight Committee’s inquiry into the Commanders is a major focal point of the probe.