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After the shock of a gunman killing 20 small children and six adults at an elementary school in Connecticut, districts are increasing police patrols, locking schools' doors and taking other steps.
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Live updates about one of the worst mass murders in U.S. history — the attack on an elementary school in Newtown, Conn. Twenty young children and six adults were murdered. The man identified as the killer and one other person at a home in Newtown are also dead.