1. STILL: Parents wait for news after a reports of a shooting at Marjory Stoneman Douglas High School in Parkland (ID 18054735103569)
2. STILL: Anxious family members wait for news of students as four people embrace
3. STILL: A woman consoles another as parents wait for news regarding shooting
4. STILL: Students wait to be picked up after shooting incident, one holding a giant teddy bear (ID 18068834016450)
5. STILL: Family members embrace following high school shooting, girl holds a Valentine Day, heart-shaped balloon (ID 18045806639919)
6. STILL: A parent talks on a mobile phone as she waits for news following shooting
7. STILL: Law enforcement officers block off a street following shooting (ID 18069011791574)
8. STILL: An armed law enforcement officer tells anxious family members to move back after high school shooting incident
9. STILL: A member of Broward County Sheriff's Office stands watch at the site of shooting
Coral Springs, Florida - 14 February 2018
10. STILL: Law enforcement vehicles arrive at a nearby hotel in Coral Springs where parents were instructed to pick up their children following shooting at Marjory Stoneman Douglas High School in Parkland (ID 18046019327864)
11. STILL: Family members pick up students at nearby hotel
Just before the shooting broke out, some students at Marjory Stoneman Douglas High School thought they were having another fire drill.
Such an exercise had forced them to leave their classrooms hours earlier. So when the alarm went off on Wednesday afternoon shortly before they were to be dismissed, they once again filed out into the hallways.
That's when police say 19-year-old Nikolas Cruz, equipped with a gas mask, smoke grenades and multiple magazines of ammunition, opened fire with a semi-automatic weapon, killing 17 people and sending hundreds of students fleeing into the streets. It was the nation's deadliest school shooting since a gunman attacked an elementary school in Newtown, Connecticut, more than five years ago.
Frantic parents rushed to the school to find SWAT team members and ambulances surrounding the huge campus and emergency workers who appeared to be treating the wounded on sidewalks. Students who hadn't run began leaving in a single-file line with their hands over their heads as officers urged them to evacuate quickly.
Authorities offered no immediate details about Cruz or his possible motive, except to say that he had been kicked out of the high school, which has about 3,000 students. Students who knew him described a volatile teenager whose strange behavior had caused others to end friendships with him.
Cruz was taken into custody without a fight about an hour after the shooting in a residential neighborhood about a mile away. He had multiple magazines of ammunition, authorities said.