BUHL (AP) - Investigators and former and current employees of Mesabi Academy are raising concerns about conditions at Minnesota's largest private correctional facility for boys and whether it is following the proper channels in reporting allegations of maltreatment.

The Minnesota Department of Corrections houses and treats up to 123 boys at Mesabi Academy in St. Louis County. The boys are sent to Mesabi from juvenile courts, social service agencies and parents.

County officials recently closed a six-month investigation into allegations of sexual abuse and maltreatment, saying they had insufficient evidence to substantiate the accusations. Investigators also determined that academy staff didn't report some of the allegations to law enforcement or child protection officials.

The academy's parent company, KidsPeace, says it followed all applicable laws.