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.

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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.

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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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