You can now read 10 articles each month for free on BostonGlobe.com.

The Boston Globe

South

Two protocols for dealing with armed intruder

LOCKDOWN

Used by most school districts nationwide when an armed intruder enters a school building or grounds, the lockdown protocol asks staff and students to:

Loading comments...

You have reached the limit of 10 free articles a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than $1 a week