An Illinois state investigation has found at least 500 more Catholic clergy members accused of sexually abusing children than the 185 “credible” offenders the state’s six dioceses originally identified.

In a scathing report made public on Wednesday, Illinois Attorney General Lisa Madigan criticized the dioceses for what her investigation’s preliminary findings show to be an unacceptably deficient investigation by the Church into the abuse of minors by priests.

The dioceses neglected to investigate some cases and in some instances did not notify state child welfare workers, the state’s investigation concluded.

“Clergy sexual abuse of minors in Illinois is significantly more extensive than the Illinois Dioceses previously reported,” the report stated.

“It appears that the Illinois Dioceses have lost sight of both key tenet of the Charter and the most obvious human need as a result of these abhorrent acts of abuse: the healing and reconciliation of survivors,” the report reads. “Long after legal remedies have expired, the Catholic Church has the ability and moral responsibility to survivors to offer support and services, and to take swift action to remove abusive clergy.”

The report does not detail how many of the 690 in total allegations it considers credible or how old the accusations are.

Chicago Cardinal Blase Cupich apologized in a statement for the Church’s failures and expressed sympathy for victims.

“I want to express again the profound regret of the whole church for our failures to address the scourge of clerical sexual abuse,” Cupich said. “It is the courage of the victim-survivors that has shed purifying light on this dark chapter in church history.”

Illinois opened its investigation after Pennsylvania’s horrifying grand jury report describing in graphic detail the abuse of over 1,000 children by 301 priests over the last about 70 years.

The Church has been scrambling to explain and address thousands of allegations of abuse of minors and adult seminarians and their cover-up by Church leaders since the summer, when Cardinal Theodore McCarrick, former archbishop of Washington, D.C., resigned after accusations against him were found credible.

Editor’s Note: This article’s headline has been amended since its original publication.