Schools install $4,000 'military grade' bulletproof doors which absorb 100 rounds from assault rifle | Daily Mail Online
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Hannibal High School increases safety by installing 44 new classroom doors | KHQA
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Cutting up school doors for ventilation is a fire risk, Sturgeon told
His bullet-resistant doors are turning classrooms into safe rooms | CNN Business
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Call for fire safety talks over classroom door plans - BBC News
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Schools take opposite approaches on locking classroom doors | KOMO
