'Threatening Emails' Sent to Sony Employees After Hack

The FBI is investigating what it describes as "threatening emails" sent to some employees at Sony Pictures Entertainment, which has been the target of a hack so massive that its extent is not yet known. The agency's statement came after Variety reported that an email was sent Friday to Sony employees, written in broken English, in which the alleged hackers, known as GOP, said they planned to bring down the whole company. "Nothing can prevent us, but the only way is to follow our demand," the email reads, according to Variety — but the "demand" isn't very clear: "Please sign your name to object the false of the company at the email address below if you don't want to suffer damage. If you don't, not only you but your family will be in danger." 

The FBI issued a statement saying it is aware of the emails. "We continue to investigate this matter in order to identify the person or group responsible for the recent attack on the Sony Pictures network. Recent events underscore the persistence and maliciousness of harmful cyber criminals, and the FBI will continue to identify and apprehend those who pose a threat in cyberspace," the statement said. Sony did not respond to an NBC News request for comment, but a spokesperson told Variety "We are aware of the situation and are working with law enforcement."