Schools watchdog Ofsted says it is "very concerned" about education standards in Suffolk after carrying out 33 focused inspections in the county.
It said it had found an unacceptable number of inadequate schools and has questioned the county council's ability to support and challenge them.
The local authority said it accepted the findings of the report and stressed improvements were being made.
Sean Harford, Ofsted's Regional Director for the East of England, wants that to happen quickly.
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