Posted: Dec 15, 2017 06:25 PM MST
Updated: Dec 15, 2017 06:25 PM MST
In Washington on Monday, teen demonstrators lay on the ground in front of the White House in solidarity with the 17 victims. Others carried flags and posters.
Family and friends have identified many of the victims killed in Wednesday's shooting at a Florida high school.
Authorities say they're responding to a shooting at a Florida high school and the school has been locked down.