Excerpt:

A charter-school chain with two Toledo locations and more than a dozen sites across Ohio faces federal and state investigations based on a string of allegations about its operations.

FBI agents served search warrants last month at several schools in Ohio, Illinois, and Indiana run by Concept Schools, a Chicago-based company that manages the Horizon Science Academy and Nobel Academy chains, according to a spokesman for the bureau.

Accusations of misconduct this week by former staff of Horizon Science Academy Dayton High School have led the Ohio Department of Education to investigate that school, and possibly more.


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