At least 17 people were killed in a shooting at Marjory Stoneman Douglas High School in Parkland Wednesday, ABC News reports. The shooter, Nikolaus Cruz, is now in custody.
Video shows student hiding in auditorium seats before armed responders attempted to evacuate the building.
Twitter user @TheCaptainAidan posted photos of students cowering in their classroom, writing, "My school is being shot up and I am locked inside. I'm (expletive) scared right now."