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.
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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.

Breaking news editor Tom Uhler has been with the Star-Telegram for more than 30 years as a digital and print news editor. He’s a graduate of the University of Texas at Dallas and grew up in Dallas.