An internal investigation by a prestigious Rhode Island boarding school has found that 26 students were sexually abused by six school employees in the 1970s and 1980s.

St. George's School sent a letter to alumni Wednesday detailing the credible allegations and apologizing for not doing more at the time to keep students safe and report abusers to authorities.

The letter from the Middletown school names only one of the six former employees, an athletic trainer who was fired in 1980 and has since died. The others have now been reported to Rhode Island State Police, as have three former students accused of misconduct.

The Boston Globe was first to report on the investigation and Wednesday's letter.

The school says it is forming a support group and therapy fund for victims.