The pressure on daily fantasy sports (DFS) continues to grow amid reports that a federal prosecutor has issued a subpoena to the industry’s main trade association.

On Friday, the Wall Street Journal reported that the Illinois-based Fantasy Sports Trade Association (FSTA) had received a subpoena issued by a prosecutor in the US Attorney’s office in Tampa, Florida. The news comes one week after reports that the same US Attorney’s office had convened a grand jury to investigate the DFS industry for possible violations of the Illegal Gambling Business Act.

The subpoena reportedly ordered the FSTA to hand over copies of its board meeting minutes. A source told the WSJ that the investigation was interested in potential fraud and/or antitrust violations involving the DFS industry’s larger sites, presumably DraftKings and FanDuel.

The news comes hot on the heels of reports that the Department of Justice and the FBI were conducting their own investigation into the legality of DFS. Meanwhile, the New York Attorney General’s office is also probing the companies’ internal policies and controls and Congress is pushing for hearings into the DFS industry.