Police were told of Adam Lanza’s plan to carry out school mass shooting -- 4 years before he did

In 2008, four years before Adam Lanza went on a shooting spree at Sandy Hook Elementary School in Newtown, Connecticut, the local police were told that he planned to carry out a massacre. The local police at the time, and legal experts since, say it is unclear what officials could have done to stop the attack at the point they were alerted to Lanza violent musings.