On Friday, Adam Lanza (20) stormed into Sandy Hook Elementary School in Connecticut and killed 20 children.
He began his day fighting with his mother, who he shot in the face with a gun she had legally bought. He then headed over to the kindergarten where his mother taught. It was initially thought that Lanza was allowed into the school because they recognized him, but investigators are now saying they think he forced his way in.
He then shot the the school principal, a school psychologist and three other teachers who were holding a meeting, killing them all and wounding one other person.
After that he walked into a kindergarten class and opened fire killing 18 children and their teacher. Two additional children died in the hospital.
A school custodian ran through the school warning about the shooter, and someone else managed to get on the PA system letting the rest of the school know something was wrong.
Lanza then shot himself in the head.
Lanza was described as shy, disturbed, and autistic, but also brilliant.
Prime Minister Netanyahu, President Shimon Peres and other world leaders sent their condolences to President Obama following this senseless massacre.