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Adam Lanza, the 20-year-old Newtown, Connecticut, shooter who killed his mom Nancy Lanza and 27 others — including 20 children — before turning on self during the deadly Sandy Hook Elementary School massacre, destroyed his computer's hard drive before the attack — reported The Daily Beast

"It was pretty bad," said the FBI's computer analysis source about the damaged hard drive. "If he destroyed the computer, that means there are things on there that would concern him. It is going to be a while before they can decipher the information," the source added. 

According to The Beast, Lanza had played "a violent videogame" in which realistic characters take part in "bloody battle scenes." 

"The kid knew what he was doing," the anonymous FBI source said. "This was a planned event. There is no question about it," the source added. 

Read on The Daily Beast