SHARE 1 1 COMMENTMORE

NEW HAVEN, Conn. - The man who carried out the Sandy Hook Elementary School massacre apparently called a radio station a year earlier to discuss the 2009 mauling of a Connecticut woman by a chimpanzee.

The caller believed to be Adam Lanza speaks softly on a show on the University of Oregon's campus radio station and blames "civilization" for the animal's attack.

It would be the first known public recording of Lanza's voice. The 20-year-old man killed 20 children and six adults at the school on Dec. 14, 2012.

A person with the username "Smiggles" describes making the call afterward in a web posting. State police documents refer to instant messages from "Smiggles" as presumably being from the shooter.

A former classmate, Kyle Kromberg, told the New York Daily News that he recognized the voice as Lanza's.

Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.