Describing the offenses as "among the worst I've ever seen," a Superior Court judge sentenced an Alaska man to 30 years in prison for sexually abusing four children under the age of 13.

Raymond E. Leahy of Nenana pleaded guilty to sexual abuse of a minor.

Prosecutor Jenel Domke says the 54-year-old Leahy forced the children to abuse each other and sometimes forced one child to video tape him having sex with another.

The abuse surfaced in May 2008, when the oldest of the children
notified the Office of Children's Services. Leahy was acquainted with the children, including one who is developmentally challenged.