Newtown shooter Adam Lanza had access to multiple guns his mother had purchased and taught him to shoot, according to new information released today by a Connecticut state prosecutor.

The report said that Adam Lanza was found in the school with three firearms  — a XM15 rifle, a Glock 10mm handgun and a 9mm Sig Sauer P226 handgun. Lanza also brought a shotgun to the school but left it in the car. All of the guns were registered to his mother, Nancy Lanza.

Officials also released copies of the warrant issued to search the black Honda Civic that Lanza apparently drove to Sandy Hook Elementary the day of the shooting, as well as four warrants to search the yellow two-story home in Sandy Hook where Nancy Lanza lived with her son. (Read the documents here.)

The warrants revealed that that FBI had learned from an interview that Adam was considered by one person they interviewed to be a “shut-in” who played Call of Duty and other video games.

Here’s some of what the police found in the home:

• A brown gun safe, unlocked, with no indication that it had been broken into.
• A holiday card with a check made out to Adam from Nancy Lanza to buy a C183 (which police initially incorrectly identified as a firearm)
• One digital image print of a child and various firearms
• At least nine knives, three Samurai swords, and a spear
• Certificates for Adam Lanza and Nancy Lanza from the National Rifle Association
• Sheets and a towel stained with what police called a “blood-like substance”
• A damaged hard drive and a custom-built desktop computer
• Handwritten notes with the addresses of local gun shops
• A blue folder labeled “Guns” with receipts and paperwork
• Three books: Look Me in the Eye: My Life with Asperger’s; Born On a Blue Day: Inside the Extraordinary Mind of an Autistic Savant; and  NRA Guide to the Basics of Pistol Shooting
• An email re: Gunbroker.com, a website for buying guns, dated 10-12-11
• Three photographs of what appeared to be a dead body, covered with plastic and what appeared to be blood
• A receipt for Tin Star Shooting Range in Weatherford, Okla.

The releases come after officials were criticized for leaking information at a conference before notifying families or the public. Officials met on Wednesday to update the victims’ families on what they’ve found. The full report should be released in June.

Sarah Childress, Former Series Senior Editor, FRONTLINE