The National Basketball Players Association, already in turmoil after President Derek Fisher asked for independent reviews of its finances and business practices, is being investigated by the U.S. Attorney’s Office in Manhattan, the union said in a statement.

Union Executive Director Billy Hunter was notified of the investigation by subpoena for documents on April 25, according to two people with direct knowledge of the situation. The people were granted anonymity because they weren’t authorized to discuss the investigation.

“The NBPA will cooperate fully with the government’s investigation,” the union statement said.

– Reported by Scott Soshnick and Mason Levinson of Bloomberg