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Dozens of Mass. first responders undergo active shooter drills at Chelsea school

Nearly 100 first responders including local, state, and federal agencies participated in a drill simulating active shooter scenarios to improve coordinated response and preparedness.

Summary by WCVB
Nearly 100 local, state and federal first responders descended on a Chelsea school Saturday to participate in an active shooter drill.

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WCVB broke the news in Boston, United States on Saturday, September 13, 2025.
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