It’s been a little over a year since 20-year old Adam Lanza opened fire at Sandy Hook Elementary School in Newton, Conn., and yesterday police released the final incident report, says CNN.

The report showed that problems for Lanza began when his mother Nancy began volunteering at Sand Hook. Apparently, he believed she cared for the students more than she did him.

“Lanza apparently felt that his mother loved the students more than him,” the report read, which may explain why he shot and killed her before going to Sandy Hook and opening fire on 20 small children and six staff members.

In addition, the report showed that Nancy often dealt with Lanza having Asperger’s syndrome, although many experts believe the disorder had nothing to do with his violent rampage. Plus, a former teacher of Lanza said he seemed to have a preoccupation with war, battles and bloodshed.

“Adam would write ten pages, obsessing over battles, destruction and war,” said the teacher. The work he submitted was “so graphic that it could not be shared.”

The report also showed several text messages that Nancy sent to friends about her son’s condition and one message in particular showed her declining some sort of invitation so she could spend more time at home.

“I really wish I could but I have so much to do and want to spend a little extra time with Adam before I go,” Nancy wrote, as she was planning a lone trip to New Hampshire. “Also, lots of cooking to do because I like to leave him with all his favorites.”

Plus, an identified man who claimed that he dated Nancy once, said she was planning a trip to London that was supposed to take place on the same week of the shooting, and some believe Nancy might have noticed that Lanza was getting worse, which is why she wanted to get out of town.

“A couple of last minute problems on the home front” prevented Nancy from taking the trip,” said the unidentified man, who also knew that Lanza had a gun collection. “He knew Lanza to own weapons and that she invited him to go shooting because it was a good stress release,” the report showed.

But despite the information in the report, police admit they still don’t have a lot of insight into Lanza’s frame of mind on the day of the shooting.

“What contribution this made to the shooting, if any, is unknown as those mental health professionals who saw him did not see anything that would have predicted his future behavior,” read the report.

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