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

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

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

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

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