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WASHINGTON – The FBI on Tuesday released some 1,500 pages from its investigation into the massacre at Sandy Hook elementary school, painting a dark portrait of the young man who carried out one of the worst school shootings in U.S. history.

Adam Lanza killed his mother in their home in Newtown, Conn., then gunned down 20 children and six adult staff members at the elementary school on Dec. 14, 2012. Lanza, then 20 years old, killed himself that same day.

Virtually all of the FBI’s documents, released in response to Freedom of Information Act requests, are heavily redacted and strip out the names of witnesses and family members. In cases where the substance of the witness interviews are summarized in typed reports, the summaries are often accompanied by the hand-written notes of the interviewing agents.

Here are some highlights:

‘The weirdest person online’

The FBI interviewed a person who regularly communicated with the shooter online. Over the course of nine pages, the interview revealed Lanza’s obsession with mass murder and the 1999 Columbine High School shooting that left 12 students and one teacher dead.

Two years before the Sandy Hook attack, the witness connected with Lanza through postings on a website examining the Columbine incident. Lanza, the witness told investigators, was working on a “spreadsheet” and documenting the details of “hundreds of spree killings and mass murders.”

The witness described Lanza as “the weirdest person online,” who was singularly focused on all aspects of mass murder. “Lanza had a very negative world view,” the witness said.

Describing Lanza as deeply “depressed,” the witness said the shooter seemed to have “no effective coping mechanisms to deal with his depression.”

“He seemed to wallow in it and ride out the low periods by hiding in his room and sleeping for 12 hours or more at a time,”…