The $60 billion Ohio Public Employees' Retirement System and the $54 billion Teachers Retirement System of Ohio, both in Columbus, were named lead plaintiffs in a class-action lawsuit against Fannie Mae. The lawsuit, filed early last year in U.S. District Court in Washington, alleges that the lending agency committed securities fraud by issuing misleading financial statements and reports between 2001 and 2004. The SEC began investigating the agency last year. Ohio Attorney General Jim Petro will lead the suit. The amount of damages being sought has not yet been established.