The FBI has been investigating and working to contain a malicious cyber incident on part of its computer network in recent days, according to people briefed on the matter.
FBI officials believe the incident involved an FBI computer system used in investigations of images of child sexual exploitation, two sources briefed on the matter told CNN.
The US Justice Department seized approximately half a million dollars that North Korean government-backed hackers had either extorted from US health care organizations or used to launder ransom payments, deputy Attorney General Lisa Monaco said Tuesday as she touted an aggressive US strategy to claw back money for victims of ransomware attacks.