The director who supervised Arizona child welfare workers knew about un-investigated child abuse cases back in 2011, according to several employees.

The Arizona Republic reported that at least four workers have testified that Clarence Carter was informed about thousands of reports of child abuse and neglect that had gone without a state-mandated investigation.

Carter testified to Department of Public Safety investigators that he first learned that some cases were being labeled "not investigated" in November.

Some officials are questioning why Carter, who led the now dismantled Child Protective Services, was not disciplined after the discovery last fall of the more than 6,500 untouched cases.

A message seeking comment from Carter was not immediately returned.

Five employees connected to the un-investigated reports were fired last week.