WASHINGTON — A trove of data that hackers say they stole from the Federal Bureau of Investigation includes records revealing the home addresses of employees involved in investigating foreign spies, drug cartels and running covert surveillance operations.
While the FBI hasn’t explicitly confirmed a hack, the bureau said in a statement Wednesday that it’s “actively and aggressively” investigating what it described as “the point of breach” and whether it involved a third party or the FBI’s enterprise system itself. A cybercrime gang has claimed responsibility for the incident and provided journalists with what they say is a sample of the stolen material.
That data, reviewed by Bloomberg News, contained information about at least 3,800 current or former FBI employees, including home addresses, phone numbers, email addresses, Social Security numbers, job titles, assigned field office and details about their emergency contacts, often a spouse or family member.
As of Thursday, some FBI employees whose personal information appears in allegedly hacked material hadn’t been notified of that by bureau security, according to a U.S. official familiar with the matter who spoke on condition that t...