July 1, 2018, Los Angeles Times: Parkland school shooter: Typical of today's mass killers studied by FBI http://www.latimes.com/nation/la-na-parkland-mass-shooters-20180701-story.html In the two years before the Parkland shooter went on his murderous rampage, he warned people — at least four times — what he planned to do. Nikolas Cruz posted repeated threats on social media for anyone to see. At least three of them were reported to authorities, who did nothing to stop him. At least one other internet posting went unreported…. Cruz’s blatant warnings were exactly what you would expect from a mass killer in the internet age, as was other behavior leading up to the shootings, according to a new FBI study. The study analyzed the pre-attack behavior of 63 active shooters who killed multiple people between 2000 and 2013. More than half had communicated to someone — online or in person — that they intended to harm someone. … Mass killings like Cruz’s are on the rise…. The new research shows that only 1 in 4 of the mass shooters in the study had ever been diagnosed with a mental illness. Cruz does not appear to have been diagnosed with any severe or psychotic mental illness, though state records indicate he was treated for depression, attention deficit hyperactivity disorder and emotional behavioral disability. His mother had told officials he had obsessive-compulsive disorder, anger issues, anxiety and autism….