Search warrants from the investigation into the Newtown school shooting show police found a cache of weapons and ammo at gunman Adam Lanza's home, along with a shooting instruction manual, mental health books and a newspaper clipping about a school shooting in 2008.

The warrants were released Thursday after an order to seal them expired Wednesday. 

 Read the search warrants here: 

• Search Warrant 12/14/12 
• Search Warrant 12/14/12 5:29 p.m..
• Search Warrant 12/14/12 7:25 p.m..
• Search Warrant 12/15/12 3:03 p.m..
• Search Warrant 12/16/12 4:31 p.m.

The warrants list guns and ammunition investigators found at Lanza's home, including a Planters can with .22-caliber and .45-caliber bullets, several containers of shotgun shells and hundreds of rounds of assorted ammunition, many inside a gun safe.

Police also found a "military-style uniform in Lanza's bedroom," and throughout the home that he shared with his mother, they found multiple weapons, including at least two rifles, nine knives, a bayonet and three swords. Investigators also found paper shooting targets and an "Adam Lanza National Rifle Association certificate." The NRA said in a statement that there was no record of him as a member.

The guns that Lanza used to kill 20 first-graders, six educators and himself at Sandy Hook Elementary School were found at the scene. The prosecutor overseeing the investigation, State's Attorney Stephen Sedensky III, said Thursday that it took Lanza less than five minutes to shoot his way into the school, kill 26 people, and kill himself.

Back at the home, investigators found a holiday card with a check made out to Lanza from his mother for the purchase of a firearm. A book called "NRA Guide to the Basics of Pistol Shooting" was also found.

The warrants show that a witness, whose name was redacted from the documents, told FBI agents on the day of the shooting that Lanza "rarely leaves his home" and considers him "a shut in and an avid gamer." The witness told the agents that Lanza attended Sandy Hook Elementary and that "the school was Adam Lanza's 'life.'"

Police also seized various written documents, including seven journals belonging to Lanza, along with other "personal notes, memoirs and thoughts." None of the contents of the writings are detailed in the warrants. Photos including images of a "deceased human covered with plastic and what appears to be blood" were also taken.

Investigators also found a New York Times clipping about a February 2008 school shooting at Northern Illinois University, in which a gunman stormed a university lecture and shot 21 people, killing five before he killed himself.

Among the books that police took from the home include "Born on a Blue Day -- Inside the Mind of an Autistic Savant," "Train Your Brain to Get Happy."

Sedensky said in a statement Thursday: "This is an active, ongoing investigation. No conclusions have been reached and no final determinations have been made."

State police and local officials privately briefed victims' families at the Newtown Municipal Center Wednesday night about the release of the documents.

The father of a boy who was killed by Lanza at the school said Thursday that the information released in the documents doesn't change anything, but might help people learn and change.

"There will not be any closure," said Mark Barden. "You know, there is a huge hole in our lives, there is a huge hole in our community, with all of these lives lost. There is not going to be closure, I mean we need to move on and progress and evolve as a society, sure, but for me personally, I will never get over the loss of my Daniel.”

Authorities have said the investigation won't be completed until summer.