UPDATE: Police release documents on Newtown massacre

NEW HAVEN, Conn. (AP) - Connecticut State Police have released thousands of pages of documents from the Newtown shooting investigation.

The report says teachers from Sandy Hook Elementary School told investigators they heard janitor Rick Thorne confront Adam Lanza and try to get him to leave the school, shouting, "Put the gun down!" Thorne survived, but Lanza killed 20 first-graders and six educators before killing himself.

The documents also suggest the gunman's mother was a dedicated and loving parent, but at times bewildered by her son. Nancy Lanza told a lifelong friend about two weeks before the massacre that 20-year-old Adam was becoming increasingly despondent and hadn't left his room in three months. The documents say Hurricane Sandy had cut power to the Lanza home in late October and that had "put Adam over the edge."

Adam Lanza fatally shot his mother in the head before carrying out his rampage at the school.