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总结
美国罗得岛州布朗大学枪击案嫌疑人被指在案发前录制多段自拍视频，称袭击已筹划数月甚至多年，并在自述中未给出明确作案动机。执法部门公布部分视频文字记录称其提到对相关人员怀有怨恨且毫无悔意。案件与其被控涉及另一所高校的致命袭击一并调查，学校与地方警方加强校园安保，并引发社会对校园安全与枪支暴力风险的再度关注。
正文
Brown University gunman recorded videos saying attack was planned for months BBC Brown University shooting suspect planned attack for a long time, offering no motive in video confession, officials say CNN Suspect in Brown and M.I.T. Killings Discussed Attacks in Videos, Officials Say The New York Times Brown gunman cited grudge, expressed no remorse in videos, transcripts reveal WPRI.com Accused Brown University shooter planned attack for years, video transcripts show The Guardian
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