Plane to Denver delayed, some passengers detained at Sea-Tac Airport

September 11, 2014 02:36 PM

UPDATED September 11, 2014 02:37 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.