.
The official spoke Thursday on condition of anonymity because he was not authorized to speak publicly.
New York City-based News Corp. has been in crisis mode.
A rival newspaper reported last week that the company's News of the World had hacked into the phone of U.K. teenage murder victim Milly Dowler in 2002 and may have impeded a police investigation into the 13-year-old's disappearance.
More possible victims soon emerged: other child murder victims, 2005 London bombing victims, the families of dead soldiers and former Prime Minister Gordon Brown.
The FBI's New York office hasn't commented. There's been no response from News Corp. or to a message left with the U.S. attorney's office in Manhattan.