Daybook: Feb. 22 - Feb. 28

February 20, 2015 12:00 AM

UPDATED February 18, 2015 12:39 PM

More Videos

  • What happens during a school lockdown?

    A school lockdown is a precautionary measure issued in response to a direct or nearby threat. It requires staff and students to respond quickly and comply with rules. Here’s how it often works.