Originally uploaded to https://www.youtube.com/watch?v=wvnZBVe4950 by On Demand News Subscribe to ITN News: http://goo.gl/zRYiYn Police in Connecticut have released footage from their investigation into the shooting massacre at Sandy Hook Elementary School in December 2012. The shooting rampage in Newtown marked one of the deadliest gun violence incidents in US history. The gunman, Adam Lanza, who also shot and killed his mother before driving to Sandy Hook and forcing his way into the school he once attended, killed himself after police arrived on the scene. Twenty first-graders, ages 6 and 7, and six staff members lost their lives. The tragedy rocked the suburban town of 27,000 people and sparked a national debate about school violence and access to firearms. "I hope that the release of this report, though painful, will allow those who have been affected by it to continue in their personal process of healing, and will provide helpful information that can be put to use to prevent such tragedies in the future," Commissioner Reuben Bradford said in a letter introducing the documents. The release comes about a month after the state Division of Criminal Justice released a report on Newtown that concluded the gunman, Lanza, 20, had acted alone, and that his motive may never be known. Report by Lauren Hood. Like us on Facebook: http://www.facebook.com/itn Follow us on Twitter: http://twitter.com/itn Add us on Google+: http://bit.ly/17z0Dpd More stories from ITN: The Biggest News Stories of 2013: http://bit.ly/19ophtm The Weirdest News Stories of 2013: http://bit.ly/1ef1L1P The strangest news trend of 2013? Kids stuck in China: http://bit.ly/JwGp64 Edward Snowden's Alternative Christmas Message: http://bit.ly/1dcCt5J The Queen's Christmas Message 2013: http://bit.ly/1d8lhOI Man stops armed robber by wrestling him to the ground: http://bit.ly/1c0LVrJ Robot astronaut finally meets a human in space: http://goo.gl/fApB1i NYC taxi drivers release "sexy" calendar for charity: http://goo.gl/BoK0MF Woolwich killer gives chilling police interview about murder: http://goo.gl/wqTEmL Lee Rigby's family gives emotional statement about Woolwich attack: http://goo.gl/jnwkLW Ex-girlfriend of Lostprophets' Ian Watkins reveals his sick fantasies: http://goo.gl/c4HnHY Medical marvel! Man has hand grafted to his ankle before surgery: http://goo.gl/zQtI9a Is this one of strangest Christmas traditions we've seen? http://goo.gl/waZQKf Check out Truthloader, the new home of citizen journalism on YouTube. Subscribe now at http://bit.ly/tldrsub See 2013's Most Watched Videos: http://bit.ly/14iM9r5 See our Biggest Videos of All Time: http://bit.ly/11GI36D See 2012's Most Watched Videos: http://bit.ly/18R1boW