State police in Connecticut today are releasing thousands of pages of police documents from the investigation into last year's school massacre in Newtown, and the documents could shed additional light on the world of the 20-year-old gunman.

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

[Associated Press]