NEWTOWN, Conn. (CBSNewYork) -- Investigators may have pieced together a big part of the puzzle in determining what drove gunman Adam Lanza to murder twenty-six people at Sandy Hook Elementary School in 2012.
Lanza was apparently obsessed with Norwegian gunman Anders Breivik, who killed seventy-seven people in July, 2011 during an attack in downtown Oslo and at a teen summer cap, according to sources who spoke to CBS News Correspondent Bob Orr.
Sources indicated that Lanza wanted to top Breivik's death toll, and chose Sandy Hook because it was an easy target with a large cluster of people. Lanza may have intended to kill more but was interrupted when police responded to the shooting.
Reported Norweigian Inspiratio In Newtown Massacre
Officials have not publicly revealed what evidence they have relating to Lanza's obsession with Breivik, however, they did recover a large quantity of video games from the basement of his home.
Lanza made multiple visits to a gun range with his mother Nancy, he took her life with a gun that was registered in her name at the beginning of the shooting spree. All of the guns that were used during the shooting were registered to Nancy Lanza.
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