It is a major contractor performing background checks for the U.S. government . It said hackers breached its computer system ; FBI is investigating . It said experts ` ` believe it has all the markings of a state - sponsored attack '' Department of Homeland Security has halted providing employee data to USIS .
USIS is a major contractor providing background checks for the U.S. government . It said hackers breached its computer system ; FBI is investigating . USIS said experts `` believe it has all the markings of a state-sponsored attack '' Department of Homeland Security has halted providing employee data to USIS .