Facebook headquarters from aerial view Facebook Inc. headquarters stands in this aerialphotograph taken above Menlo Park, California, U.S., on Wednesday,Oct. 23, 2019. (Photo: Sam Hall/Bloomberg)

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(Bloomberg) — Personal banking information for tens of thousandsof Facebook Inc. workers in the U.S. was compromised last monthwhen a thief stole several corporate hard drives from an employee'scar.

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The hard drives, which were unencrypted, included payroll data such as employee names,bank account numbers and the last four digits of employees' SocialSecurity numbers, according to an email Facebook shared with staffFriday morning. The drives also included compensation information, including salaries,bonus amounts, and some equity details.

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In total, the drives contained personal data for about 29,000U.S. employees who worked at Facebook in 2018, a spokeswomanconfirmed. Facebook has faced several instances in recent years ofexposing personal data of the social network's users. However, thestolen drives didn't include Facebook user data, the spokeswomansaid.

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"We worked with law enforcement as they investigated a recentcar break-in and theft of an employee's bag containing companyequipment with employee payroll information stored on it," thespokeswoman said in a statement shared with Bloomberg. "We haveseen no evidence of abuse and believe this was a smash and grabcrime rather than an attempt to steal employee information."

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The break-in happened on Nov. 17, and Facebook realized the harddrives were missing on Nov. 20, according to the internal email. OnNov. 29, a "forensic investigation" confirmed that those harddrives included employee payroll information. Facebook startedalerting affected employees on Friday Dec. 13.

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The employee who was robbed is a member of Facebook's payrolldepartment, and wasn't supposed to have taken the hard drivesoutside the office. "We have taken appropriate disciplinaryaction," the spokeswoman said. "We won't be discussing individualpersonnel details."

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Facebook is still working with law enforcement to recover theinformation, though none of the hard drives have been found. In anemail, Facebook encouraged employees to notify their banks andoffered them a two-year subscription to an identity theftmonitoring service.

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