A gunman has opened fire at a Florida high school, killing 17 people.
Sheriff Scott Israel of Broward County said the 19-year-old suspect is in custody.
The suspect, a former student at Marjory Stoneman Douglas High School in Parkland, was previously expelled for disciplinary reasons.
Swat teams swarmed the school, and the gunman was arrested without incident off campus.
Television footage showed police putting a person in the back of a police car outside the high school.
The sheriff said the gunman had at least one rifle and multiple magazines, and most of the fatalities were inside the building though some were found outside.
The suspect was later identified as Nicholas Cruz.
There were scenes of students frantically running from the building and ambulance crews treating people outside the school on Wednesday afternoon.
Broward County Superintendent Robert Runcie said: “There are numerous fatalities. It is a horrific situation.”
He added: “It is a horrible day for us.”