A Roman Catholic boarding school in Rhode Island says an investigation has found credible new allegations of sexual abuse committed decades ago by two monks.

The Portsmouth Abbey School sent a letter Wednesday summarizing the allegations and apologizing to any victims. The abuse is alleged to have occurred between 1959 and the early 1980s. The school says one of the accused monks has since died, and the other is critically ill.

The school hired a law firm to investigate after the sudden resignation of its chancellor last year. Last August, the firm reported no findings that he did anything illegal, but responses to that report surfaced new allegations against the two monks, who had been previously accused of abuse.

The school says the abbey will fund therapy for those abused.