NEW HAVEN, Conn. (AP) -- Police in Connecticut have released thousands of pages of documents from the investigation into the school massacre in Newtown. They provide the most detailed picture yet of the rampage and of the 20-year-old gunman's fascination with guns and violence.
The paperwork, photos and videos were heavily blacked out to protect the names of children and to withhold some of the more grisly details of the crimes.
The documents released Friday fill in more details about how the shooting unfolded, teachers protected their students and the school janitor confronted the shooter.
Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, after killing his mother inside their home. He committed suicide with a handgun as police arrived at the school.
Here are some highlights of the documents, which supplement a summary report that was released earlier:
-- A man who dated gunman Adam Lanza's mother, Nancy, in 2011 said she told him in an email that she had scheduled a trip to London the week of the shooting but canceled at the last minute because of "a couple last minute problems on the home front."
-- A friend of Nancy Lanza's told investigators she had planned to sell their home in Newtown and move to Washington state or North Carolina, where she hoped Adam could get a job. She planned to buy an RV for Adam to sleep in. If they went to Washington, Nancy said, there was a special school where she planned to enroll him. In North Carolina, she said, a friend owned a computer firm and had agreed to give Adam a job and teach him the business.
-- Police were cautious about interviewing the surviving children. Interviews were done only if the children or their parents requested them. If the child didn't want to talk, the interview was ended immediately. After the interview, the children were given a copy of the children's book "A Terrible Thing Happened" to help them process what they had seen.
-- Many teachers told investigators they initially thought the gunshots were someone banging things around. They realized what was happening after hearing a second round of shots, smelling gun smoke or having someone run into their classroom to warn them. They said they quickly locked classroom doors and covered windows with paper.
-- Five teachers were meeting in Classroom 20 between 9 and 9:30 a.m. when they heard banging. Someone entered the room and told them to leave because he thought he smelled gunpowder. They began to hide, and then broke a window to climb out. Four of the five crawled out, but one couldn't get through the window and stayed behind. The ones who escaped ran to a Subway restaurant across the street from the school.
-- Teachers told investigators they heard janitor Rick Thorne confront gunman Adam Lanza and attempt to get him to leave the school. One teacher, who was hiding in a closet in the math lab, heard Thorne yell, "Put the gun down!" Thorne was not killed.
-- A former teacher of Adam Lanza's said his parents were not "up front" with teachers about his mental abilities. The teacher recalled Lanza responding to a creative writing assignment by "obsessing about battles, destruction and war." The teacher called the level of violence "disturbing."
The planned release of thousands of pages of state police documents from the investigation into last year's Newtown school massacre could shed light on the world of the 20-year-old gunman.
Prosecutors issued a summary of the investigation last month that portrayed gunman Adam Lanza as obsessed with mass murders, but concluded that Lanza's motives for the massacre might never be known.
The report referred to items found on a computer at Lanza's house that included writings that detail relationships, personal beliefs, a daily schedule, desires and goals.
Lanza gunned down 20 first-graders and six educators with a semi-automatic rifle at Sandy Hook Elementary School on Dec. 14, 2012, after killing his mother inside their home. He committed suicide as police arrived at the school.
The documents will be released Friday.