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NEW HAVEN, Conn. -- Police in Connecticut have released thousands of pages of documents from the investigation into last year's school massacre in Newtown.

The Friday afternoon release could shed additional light on the world of the 20-year-old gunman, Adam Lanza.

The paperwork "has been redacted according to law," and it includes text, photos and 911 calls received by state police.

Prosecutors issued a summary of the investigation last month that portrayed Lanza as obsessed with mass murders, but the report concluded that Lanza's motives for the massacre might never be known.

Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, after killing his mother inside their home. He committed suicide with a handgun as police arrived at the school.