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总结
美国司法部马萨诸塞州联邦检察官办公室就涉及布朗大学相关枪击与马萨诸塞州布鲁克莱恩枪击案发布调查更新。官员称，嫌疑人曾录制多段视频自述并讨论袭击细节；多家媒体报道其在行凶前筹划数月，并留下可供核验的影像或文字记录。相关部门公布或整理视频与文字材料，以厘清作案动机、时间线与受害者情况，并为后续刑事指控及校园、社区安全管理提供依据。
正文
District of Massachusetts | Update on Investigation into Brown University and Brookline Shootings Department of Justice (.gov) Suspect in Brown University mass shooting confessed in a series of videos, officials say CNN Shooter who killed Brown students, MIT professor had been planning for months and left videos, officials say NBC News US releases video transcripts of man believed to be Brown University shooter The Guardian Suspect in Brown and M.I.T. Killings Discussed Attacks in Videos, Officials Say The New York Times
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