The FBI says it has identified three people involved in a massive cyber-espionage campaign against Sony Pictures Entertainment, the film studio and its parent company, 21st Century Fox.
The FBI says in a statement that it has also uncovered evidence of a second, larger cyber-infiltration campaign targeting multiple institutions.
The FBI’s statement didn’t say how long the cyber-attacks had been ongoing or where the information came from.
The statement does not elaborate on the specific targets of the attacks.
The announcement comes on the heels of the revelation that two hackers from the same group responsible for the attacks at the end of last year had been found in Georgia, according to documents leaked by former U.S. intelligence contractor Edward Snowden.
A third man who has since been arrested in Georgia is believed to have been the man behind the first attack.
Sony said it was “working to provide more information about the individuals involved and we will provide additional updates as we can.”
The FBI did not immediately respond to a request for comment.
In addition to Sony, the FBI said it uncovered evidence that an unspecified group of people was responsible for stealing data from banks in China, Iran and Iran-backed Houthi rebels in Yemen, and the data was then used to hack into other organizations.
A fourth man, who the FBI says was arrested in New York on Thursday, was also suspected of participating in the attacks, the statement said.
The man’s arrest was not immediately known.
In a statement, 21ST Century Fox said it has taken significant steps to strengthen our security measures to protect our data, including strengthening our perimeter and monitoring and reporting all activity to our customers.
We have also begun a comprehensive security review to better understand the circumstances surrounding the events described by the FBI, and will provide further updates as soon as they are available.