Adam Lanza, 20. (Photo credit: AP)
Two years after Adam Lanza opened fire at Sandy Hook, investigators revealed new details about why he did it.
Investigators found Lanza planned the attack and was obsessed with mass murders. He was a native of Newtown, Conn., and attended Sandy Hook when he was young.
The Sandy Hook Advisory Commission hopes the report will help government officials and citizens prevent these types of tragedies from occurring.
Mass Shooting Tragedies 