A cyber attack at a firm that performs background checks for U.S. government employees compromised data of at least 25,000 workers, including some undercover investigators, and that number could rise, agency officials said. The breach at Falls Church, Virginia-based US Investigations Services (USIS) exposed highly personal information of workers at the Department of Homeland Security's headquarters as well as its U.S. Immigration and Customs Enforcement and U.S. Customs and Border Protection units, two officials familiar with the investigation into the breach told Reuters.
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