Update: Invesigators behind the Sandy Hook school shooting in Newtown, Conn. last December plan to release a report on Monday, November 25, that documents additional information about the gunman and the police response on the day of the tragedy.

On December 14, 2012, one of the worst school shootings in history took place when Adam Lanza killed 20 children and six women inside Sandy Hook Elementary School in Newtown, Conn. Our experts have looked at topics such as the shooter’s motives, mental health, historical trends of violent crimes such as this, as well as community response, how parents should talk to their children about violence and the incident, and what we can learn going forward. The shooting’s aftermath also prompted a nation-wide push for increased gun control and increased background checks for gun purchasers.