CLEVELAND — FBI and IRS agents served at least 10 search warrants Monday at Cuyahoga County offices and homes as part of a public corruption investigation, authorities said.

About 200 FBI agents went to the county administration building in Cleveland. Agents, some brought in from Pittsburgh to help with the searches, also searched the county engineer's office and an information services center.

"This stems from a long-term public corruption investigation," FBI spokesman Scott Wilson said. "The warrants are sealed through the court and basically I cannot comment on anything that's being searched or seized."

The county was cooperating with the investigation, said Administrator James McCafferty.

Staffers at the county's information services center said they were told they could go home because they wouldn't be able to work. About 80 are employed at the center, which does computer work for various county agencies.

McCafferty said agents entering the administration building had a search warrant for County Commissioner Jimmy Dimora's office. Dimora's home also was searched, The Plain Dealer reported on its Web site.

Dimora did not immediately respond to calls seeking comment.