A second suburban school district has been drawn into the public-corruption probe that threatens to upend the deeply entrenched power system that runs Cuyahoga County.

Warrensville Heights schools have received a subpoena ordering officials to turn over all documents showing any relationship between the district and more than a dozen contractors whose names already have surfaced in the probe.

They include the law firm Vorys, Sater, Seymour and Pease and attorney Anthony O. Calabrese III; 1-888-Ohio Comp and its owners, the Lucarelli family; and Nature Stone and other companies connected to Rusty Masetta.

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For more on the federal investigation in Cuyahoga County visit cleveland.com/countyincrisis

The probe first became public last July, when 175 agents raided the homes and offices of County Commissioner Jimmy Dimora, Auditor Frank Russo and county employee J. Kevin Kelley along with the offices of several contractors.

Federal prosecutors also have demanded documents from two county judges, MetroHealth Medical Center, the Cuyahoga Metropolitan Housing Authority and contractors including Nature Stone and Ohio Comp, which handles workers' compensation claims.

The Warrensville Heights district received its subpoena in February, the same month Parma schools received a subpoena seeking information about that district's relationship with many of the same contractors.

The subpoena gave a deadline of a week ago for the Warrensville Heights schools to turn over the documents, but school attorneys talked to federal prosecutors in the case and received an extension.

How many of the contractors or people listed on the subpoena did business with Warrensville Heights schools is unclear.

The school's business manager, Jim Russo, confirmed Tuesday that the Vorys law firm worked for the district until January and that 1-888-Ohio Comp manages workers' compensation claims for the district.

But the school had no dealings with some of the other contractors listed on the subpoena, Russo said, although he declined to say whom.

Russo said he is not related to the county auditor. But a Warrensville Heights school board member does have ties to Frank Russo and to Kelley, a former Parma school board president.

Pamela O'Bannon -- who served as president of the Warrensville Heights school board last year -- worked as an office assistant in Russo's office until 2002, when she went to work for Parma schools' business department. At the time, the business department was controlled by Kelley, whom O'Bannon had befriended when the two worked for Russo.

In Parma, where she worked until 2005, O'Bannon served as the school's risk manager, working directly with 1-888-Ohio Comp. The district hired the company with Kelley's support.

On Tuesday, O'Bannon confirmed her friendship with Kelley but avoided questions about 1-888-Ohio Comp, saying she had to go to a meeting at work. She said she would call a reporter later but did not.

Attorneys familiar with the case have said prosecutors are still gathering information, sending out hundreds of subpoenas to municipalities, public agencies, contractors and others. So far, they have charged only one person.

Henry Picozzi, a superintendent and project manager for K&D Group Inc., was accused this month of bribing two Cleveland building inspectors in connection with the Stonebridge development on the west bank of the Flats in 2007.

It is unclear when the Warrensville Heights district will turn over records to a grand jury.

The school board has hired an electronic-data retrieval company to compile the documents. On Tuesday, that company spent the day copying the school's computer servers and the hard drives from desktop and laptop computers, said Inajo Davis Chappell, the school's attorney.

The company then will scour the files looking for any information about the contractors and names listed on the subpoena. "I think it's the smart and prudent thing to do," Chappell said.