Report Due on Sandy Hook Shooting Investigation Investigators planned to release a long-awaited report Monday on the Newtown school shooting that could provide some of the first official answers to questions about the history of the gunman and the police response to one of the worst school shootings in history. The summary report by the lead investigator, State's Attorney Stephen Sedensky III, comes nearly a year after the massacre of 20 children and six women inside Sandy Hook Elementary School. The Dec. 14 shooting plunged the small New England community into mourning, elevated gun safety to the top of the agenda for President Barack Obama and led states across the country to re-evaluate laws on issues including school safety. The report expected Monday afternoon will not include the full evidence file of Connecticut State Police, which is believed to total thousands of pages. The decision to continue withholding the bulk of the evidence is stirring new criticism of the secrecy surrounding the investigation. Dan Klau, a Hartford attorney who specializes in First Amendment law, said the decision to release a summary report before the full evidence file is a reversal of standard practice and one of the most unusual elements of the investigation. Twenty-year-old Adam Lanza killed his mother inside their Newtown home before driving to his former elementary school, where he fired off 154 shots with a Bushmaster .223-caliber rifle within five minutes. Warrants released in March detailed an arsenal of weapons found inside the Lanza home. But authorities have not provided details on the police response to the shooting, any mental health records for Lanza and whether investigators found any clues to a possible motive for the rampage. Sedensky has gone to court to fight release of the 911 tapes from the school and resisted calls from Connecticut's governor to divulge more information sooner. New Britain Superior Court Judge Eliot Prescott said Monday he will listen to the 911 recordings from the school before ruling on whether they can be publicly released. He said his ruling would not come Monday.