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美国政府正将围绕乌克兰战争的机密材料的明显披露视为内部人员的泄漏，联邦调查局利用图像中的线索来帮助其刑事调查。大部分文件似乎来自中央情报局的行动中心和五角大楼的参谋长联席会议。
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国防部在处理机密文件方面有广泛的程序，包括打印记录、隐形标记和内部摄像头。前情报界和五角大楼官员表示，这些文件将被几百人查阅，而其他文件将被限制在一个更小的群体中。
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《华尔街日报》无法独立鉴定这些文件，但它们所包含的细节足以使其具有可信度。国防部官员表示，他们相信一些文件可能是真实的，联邦调查局正在根据他们收集的证据进行实验室分析，这可能会引导调查人员找到其他线索。
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泄露的文件似乎被打印并折叠了两次，背景中可以看到诸如狩猎杂志、一把刀和一管胶水等物品。这可能是一个老练的对手为了甩掉调查人员而设计的，因为不排除有外国资助的情报行动或对机密信息处理不当的可能性。微软公司 总裁布拉德-史密斯（Brad Smith）说，他的公司的 "数字威胁分析小组 "已经发现了俄罗斯人渗透到围绕电子游戏的在线社区中的努力。
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过去在追踪泄密者时，围绕机密文件的安全控制被证明是至关重要的。2017年，政府迅速查明了国家安全局的承包商Reality Winner，他打印了最高机密的材料，并将其发送给截获者。在另一次泄密事件中，联邦调查局特工特里-阿尔伯里因将不同机密文件中的信息剪切并粘贴到一个新的文件中，然后打印出来，以及从他的电脑屏幕上拍摄机密文件而被确认。这两个人都因披露信息而在监狱中服刑。
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拜登总统在被问及有关泄密调查的最新情况时说，他对泄密事件的发生感到担忧，但 “据我所知，没有任何具有重大意义的同期事件”。他说，情报界和司法部正在进行全面的调查，而且他们正在接近。
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The U.S. government is treating the apparent disclosure of classified material surrounding the war in Ukraine as an insider’s leak, with the Federal Bureau of Investigation using clues in the images to aid its criminal investigation. The bulk of the documents appear to originate from the Central Intelligence Agency’s Operations Center and the Pentagon’s Joint Chiefs of Staff.
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The Defense Department has extensive procedures around the handling of classified documents, including printing logs, invisible markings, and internal cameras. Former intelligence community and Pentagon officials suggest that the documents would be accessible to several hundred people, while others would be restricted to a much smaller group.
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The Wall Street Journal was not able to independently authenticate the documents, but they contain enough detail to give them credibility. Defense officials have said they believe some of the documents could be authentic, and the FBI is conducting lab analysis from the evidence they collected, which could lead investigators to other clues.
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The leaked documents appear to have been printed and folded twice and items such as a hunting magazine, a knife and a tube of glue were visible in the background. This could have been contrived by a sophisticated adversary to throw off investigators, as the possibility of a foreign-sponsored intelligence operation or mishandling of classified information has not been ruled out. Microsoft Corp. President Brad Smith said his company’s “digital-threat analysis team” has spotted efforts by Russians to infiltrate online communities around videogaming.
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Security controls around classified documents have proven vital in the past when tracking down leakers. In 2017, the government quickly identified Reality Winner, a contractor for the NSA, who had printed out top-secret material and sent it to the Intercept. In another leak, FBI special agent Terry Albury was identified for cutting and pasting information from different classified documents into a new one and then printing it, as well as taking pictures of classified documents from his computer screen. Both individuals served time in prison for their disclosures.
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President Biden, when asked for an update on the leak investigation, said he was concerned that the leak happened but “there’s nothing contemporaneous that I’m aware of that’s of great consequence”. He said a full-blown investigation is underway with the intelligence community and the Justice Department, and they are getting close.