By Susan Candiotti and Ben Brumfield, CNN) — Police released new documents related to the shootings last year at Sandy Hook Elementary School in Connecticut, but a motive for the attack by the troubled young man remained elusive.
Included in the information released Thursday 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.
Investigators found more than 1,600 rounds of ammunition in the house, and a holiday card with a check “made out to Adam Lanza for the purchase of a C183 (firearm), authored by Nancy Lanza,” according to a search warrant.
In an interview with a person whose name was redacted, the person said that Lanza rarely left his home and that the speaker considered him to be a shut-in “and an avid gamer who plays Call of Duty, amongst other games.” “Call of Duty” is a computer-based war game.
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. Relatives of the victims were briefed Wednesday about the documents.
State police are continuing their investigation, which is not expected to be completed until June, he said.
The killings have led Connecticut legislators to re-examine the state’s gun laws, which are among the nation’s strictest, and have reopened a national debate on gun control.
U.S. Sen. Richard Blumenthal, D-Connecticut, has announced plans to introduce legislation requiring background checks to purchase ammunition. He has pressured members of his state legislature to take action to bolster his efforts on a national level.
CNN’s Susan Candiotti and Samira Jafari contributed to this report.