FBI agents served warrants at Midwest charter schools, including some in Columbus, more than a month ago. But few details have emerged to explain why.

Chicago-based Concept Schools, which runs 19 Horizon Science academies as well as Noble Academy in Ohio, confirmed last week that Horizon Science Middle School in Columbus and the Columbus regional schools office were served warrants. Concept Schools manages four charters in Columbus.

A spokeswoman for the network said it is cooperating with the inquiry into its use of federal technology grants.

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