Nightly News | November 25, 2013
>>> with the first snap of cold wintry weather and the christmas decorations going up, in one new england town it brings so much sadness. a reminder that it's now almost been a year since the awful tragedy in newtown, connecticut . tonight investigators released a summary of the final report . it concludes that 20-year-old adam lanza acted alone when he fatally shot his mother, then carried out a massacre at the sandy hook elementarile school, killing 20 children and six adults. a lot of this information is difficult to report and comprehend. we get more tonight from nbc's rehema ellis.
>> reporter: today's report from the connecticut state attorney offers a minute-by-minute account of the crime and the best insight yet into the young man who caused the tragedy at sandy hook elementary. the first 911 call came in around 9:35 a.m . police are there in four minutes. the entire horrible event is over in about five minutes with the gunman's suicide. suspected and now confirmed by the report, adam lanza acted alone when he blasted his way into sandy hook element t try school with his rifle. he planned his actions including the taking of his own life with this glock handgun. the report states lanza had significant mental health issues that affected his ability to live a normal life and to interact with others. he lived in his mother's home in a room with gar the badge bags taped over the window. his computer contained images of suicide and mass shootings. he was prescribed therapy and medication but no health professional saw violent tendencies. he was eventually home schooled . according to the report, lanza's mother was concerned about him. he would only communicate with her by e-mail though they were living in the same house.
>> adam lanza had tremendous problems in his life. all of these warning signs, so to speak, do not allow us to anticipate the outcome.
>> reporter: an outcome that people in the community are still struggling with.
>> this will be the most widely read and reviewed criminal report since the lindbergh kidnapping many, many, many years ago.
>> reporter: investigators say more than 301 rounds of ammunition were with found t at the school, including 147 rounds lanza still could have used. with all the questions the report may answer, the answer that's so important to so many families in newtown is why. but after nearly a year-long investigation there is still no answer. brian?
>> rehema ellis in danbury, connecticut ,