HARRISBURG — The Pennsylvania Turnpike Commission said Friday it was cooperating with a demand for documents by state prosecutors, but the subject of the investigation was not clear.

Turnpike spokesman Bill Capone said records had not yet been turned over.

"We can't provide you with any other details of when it came, or what it's about or anything like that," he said.

Kevin Harley, a spokesman for Attorney General Tom Corbett, declined to comment.

Turnpike officials called the governor's office Friday to disclose the receipt of a subpoena, and aides informed Gov. Ed Rendell.

"I talked to the governor. He said, 'Well, certainly they need to comply and cooperate fully with the investigation,'" said Steve Crawford, Rendell's chief of staff.

Crawford said the subpoena was the first official notice the administration has received of an investigation by the attorney general's office.

Capone said he "did not know anything official" about reports that a grand jury was examining possible corruption at the agency, which has been criticized for years as a patronage haven.

In September, The Morning Call of Allentown reported a former Turnpike employee, speaking on condition of anonymity, said he had been questioned by a grand jury about patronage, campaign donations and contracts.

Turnpike chief executive Joe Brimmeier declined to discuss the investigation.

"I am not commenting on anything regarding any of those things until everything is sorted out," he said.

The Turnpike commission is an independent agency with five board members who are nominated by the governor and confirmed by the Senate.

The agency surfaced repeatedly in testimony during the recent federal corruption trial of former state Sen. Vincent Fumo, D-Philadelphia.

In March, Rendell ousted the Turnpike commission's chairman, citing "overwhelming" evidence from trial testimony Mitchell Rubin accepted $150,000 in taxpayer-paid work that apparently was never done. Rubin has not been charged with any wrongdoing.

The federal jury convicted Fumo on all 137 corruption counts against him.