President Donald Trump called the suspect in Wednesday's Florida school shooting "mentally disturbed."
Nikolas Cruz has been charged with 17 counts of premeditated murder after the shooting spree at Marjory Stoneman Douglas High School in Parkland, Florida.
Trump tweeted Thursday, "Neighbors and classmates knew he was a big problem. Must always report such instances to authorities, again and again!"
Cruz's social media pages display a fixation with weaponry.
