People are trying to understand the actions of the man who took the lives of 27 people, 20 of them were Sandy Hook Elementary School children as young as five.
Other children saw what no child should see.
Bear Nikitchyuk was inside the school when the shooting occurred.
"I saw some of the bullets go past the hall that I was right next to, and then a teacher pulled me into her classroom," Nikitchyuk said.
Police said the gunman, 20-year-old Adam Lanza, killed his mother, Nancy, in their home, then drover her car to the school where she worked as a teacher.
Former FBI agent Harry Trombitas said killing a loved one before a mass murder is not uncommon. He added that it is often to spare that loved one from being hurt about what the shooter is plans to do.
What Lanza did was enter the elementary school with two semi-automatic handguns and began firing, killing students in two classrooms before he turned the gun on himself.
Trombitas said there is no real profile for a mass murderer.
He said many have mental issues.
Police questioned the gunman’s brother, Ryan Lanza, who lives in New Jersey, but so far there is no word of a motive.
As for why Adam Lanza committed this unspeakable act, Trombitas said we may never know his exact motivation because everyone has their own.
“People don’t just snap,” Trombitas said. “Usually there’s some type of grievance, real or perceived.”
Trombitas said he worries about “copy-cats,” people who want to make a name for themselves and resort to large-scale violence to do so.
He urged us all to report any threat or warning sign, whether written or by word-of-mouth, to authorities.