"It was a targeted attack," said Kellermann, who serves on the International Cyber Security Protection Alliance.

工作并在世界银行库房中负责网络情报安全。 先正在国际网络安全保护联盟工作的凯勒曼说，“这是有目地性的攻击”。

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Early on Wednesday, Mr. Kellermann went to the basement of his brick home and hanged himself, according to people familiar with the situation who were not authorized to speak.

根据某些了解情况但是无权对外发言的人士透露，周三的早些时候，凯勒曼走进他砖砌房子的地下室里，并且上吊。

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The pressures were already immense when David B. Kellermann was promoted to the top financial position at the mortgage giant Freddie Mac last September. Then they got even worse.

去年9月，大卫·凯勒曼被提拔到按揭贷款巨头房贷美的高级财务职位时，公司所面临的压力已经十分巨大，随后情况还进一步恶化了。

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"It's a poster child for what's wrong with the rent-regulation system in New York City, " Ms. Kellermann said.

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Arthur Kellermann and Frederick Rivara wrote in opposition in the Journal of the American Medical Association last month.

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Kellermann said that a "giant arms bazaar" has developed in Eastern Europe by which criminals sell cybertools to others.

CNN: Doug Gross,