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Gun brandished at Virginia’s Springfield Town Center prompts 45-minute lockdown

1 shot near High Point High School in Beltsville, prompting temporary lockdown

Maryland State House lockdown prompted by threatening call lifted, nothing suspicious found

Glen Burnie High School substitute charged after school lockdown

Report of suspect carrying what looked like ‘long gun’ prompts lockdown at Bowie High

Joint Base Andrews lifts lockdown following report of armed person