(CNN) - Hackers may have gotten their hands on information belonging to government employees.
USIS, a major contractor for the U.S. government, says hackers breached its computer system. The company provides background checks for the government.
USIS said it believes a foreign government might be responsible.
In a statement, the company said the cyber attack had "all the markings of a state-sponsored attack."
The FBI is investigating.
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