WASHINGTON (AP) — Two government agencies Wednesday said they limited operations Wednesday with a major government contractor that oversees hundreds of thousands of security clearance background checks for civilian and military workers after the contractor reported it had been targeted by a cyberattack.

The contractor, USIS, did not identify the suspected culprit but said in a statement Wednesday that the cyberattack had “the markings of a state-sponsored attack.” An official with the Department of Homeland Security said the intrusion may have compromised some of its employees’ information.