The FBI has issued a security warning to Netwalker ransomware operators targeting USA but also other countries, advising ransomware victims not to pay the ransom they are asked to report to the FBI.

The U.S. nuclear weapons agency and at least three states were hacked as part of a suspected Russian cyber-attack that struck a number of federal government agencies, according to people with knowledge of the matter, indicating widening reach of one of the biggest cybersecurity breaches in recent memory.