The Arizona State Board for Charter Schools has ordered three charter schools that earned failing ratings on state assessment tests to close.

The Arizona Charter Schools Association said the move shows the state is carefully monitoring charters, which are essentially public schools that receive state funding but are run by private entities.

The charter schools board issued notices to revoke the contracts of Omega Schools, Inc., Founding Fathers Academies, Inc., and Kin Dah Lich'ii Olta' on Monday. The actions were taken after students at the schools failed statewide assessment tests three years in a row.

The Arizona Department of Education issued F grades to 11 schools this year, five of which were charters. Two of the five charters have already closed.