The advocacy group March For Our Lives produced a powerful video of a young student leading an active shooter training.
In the video, an office in California is having its staff trained.
The “security expert” introduced to lead the group is a young schoolgirl.
This year, there have been more than a dozen school and college shootings in the United States.
Some U.S. cities and states have changed laws including raising the age limit for owning guns.
But, the U.S. federal government has made little progress enacting any nationwide gun safety legislation.