Included in the new information is the report that a gun safe was found in the bedroom of 20-year-old Adam Lanza, who took guns belonging to his mother, Nancy, and shot her in her forehead in her bed. Then he went to the school in Newtown, where he gunned down 20 children and six staff members before killing himself.
Relatives of the victims were briefed Wednesday about the documents, which were released Thursday morning.
Some of the documents, released by state prosecutors, have been redacted at the prosecutors' request, said Paul Vance, a spokesman for the Connecticut State Police.
The documents may contain new information but perhaps no big surprises, Vance said before the documents' release.
State police are continuing their investigation, which is not expected to be completed until June, he said.