Sources close to the Sandy Hook investigation offered this disturbing detail to CBS News over the long weekend about Adam Lanza’s possible motivation:

Sources say Lanza saw himself as being in direct competition with Anders Breivik, a Norwegian man who killed 77 people in July 2011. … Two officials who have been briefed on the Newtown, Conn., investigation say Lanza wanted to top Breivik’s death toll and targeted nearby Sandy Hook Elementary School because it was the “easiest target” with the “largest cluster of people.”

Evidence shows that his mind, sources say, Lanza was also likely acting out the fantasies of a video game as he killed 20 first graders and six adults at the school. For Lanza, the deaths apparently amounted to some kind of “score.” … Officials have not publicly revealed what led them to the motive, but sources say investigators have found evidence Lanza was obsessed with Breivik.

It’s difficult to know how much stock to put in the report. For starters, similar loosely sourced stories about what happened in Newtown have a somewhat mixed track record when it comes to accuracy (as Lanza’s brother, Ryan, can no doubt attest to).