Seventeen people were killed and at least 14 others were taken to area hospitals after a shooting Wednesday at Marjory Stoneman Douglas High School in Parkland, Broward County Sheriff Scott Israel said.
The lone shooter was taken into custody off campus.
Israel told reporters that Nikolaus Cruz, 19, was previously expelled from the high school.
Israel said Cruz used an AR-15 rifle in the shooting and was equipped with multiple magazines.
He was taken into custody without incident.