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总结
据多家美媒援引执法与知情人士消息，美国布朗大学相关枪击案及麻省理工学院一名教授遇害案调查出现新进展：嫌疑人被指因长期积怨酝酿并实施袭击，提前数月筹划准备。官员称其在案后留下多段“自白”视频，内容涉及动机与行凶经过，成为警方与司法部梳理案情的重要线索。事件造成多人伤亡，引发高校与社区对校园安保、风险预警及后续司法处置的关注。
正文
Lengthy grudge motivated Brown mass shooting, MIT professor killing: Sources ABC News Suspect in Brown University mass shooting confessed in a series of videos, officials say CNN Suspect in Brown University Shooting Confessed in Videos The Wall Street Journal Suspect in Brown University shooting, MIT professor's death left behind confessional videos, officials say The Boston Globe Shooter who killed Brown students and MIT professor planned attack for months, DOJ says Politico
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