JenniferTintner/Twitter Florida shooting suspect Nikolas Cruz posted pictures of guns and knives on Instagram. Police are actively investigating his "disturbing" internet history. Former classmates said Cruz was "crazy about guns." Nikolas Cruz, the teenager suspected of killing 17 people in a high school shooting in Florida, flaunted his obsession with guns on Instagram. Various media outlets have taken screenshots of his account, which appeared to display his preoccupation with guns and knives.