President Donald Trump says it appears the suspect in Florida's deadly school shooting is "mentally disturbed".
Trump tweeted on Thursday about the shooting at a Parkland, Florida, high school.
A former student opened fire on Wednesday with an AR-15 rifle, killing 17 people. The 19-year-old was charged on Thursday morning.
Trump tweeted: "So many signs that the Florida shooter was mentally disturbed, even expelled from school for bad and erratic behavior. Neighbors and classmates knew he was a big problem. Must always report such instances to authorities, again and again!"
The president offered sympathy in another tweet on Wednesday and said he spoke with Florida's governor, but he has not addressed the nation.
Trump has cited mental health before as a cause for mass shootings, dismissing questions about gun control.