Cyber-attacks have been going on since 2008, when the World Wide Web was born, and the latest threat is far from new.
The FBI said that over a period of six months, it detected more than 50 cyber-attacks, with one claiming the personal information of up to 3 million people.
The malware attack, dubbed Doxing 2.0, was found in October.
The U.S. has had more than 100 cyber-related attacks on government organizations since 2009, according to the Bureau of Justice Statistics.
Read more from Newsweek.com:The cyberattack targeted an email server that belonged to the U.K.-based National Cyber Security Centre (NCSC), the U,K.
The NCSC had been conducting cybersecurity exercises with other agencies.
The NCSC, which has been accused of cybercrime in the past, said in a statement that it has “zero tolerance for cyberattacks” and that it “continues to investigate these incidents.”
The attacks have come at a time of increased interest in cybersecurity, with the White House and the State Department pushing for new ways to fight cybercrime.
The FBI said the hackers targeted the email server of the National Security Agency (NSA), which is a part of the U.,K.
The hackers also stole a database of emails, phone numbers, and passwords for the Office of Personnel Management (OPM), according to a cybersecurity official with direct knowledge of the investigation.
The OPM said it had not seen any evidence that the attackers had accessed its network.
The attack on the NSA server, however, appears to have been more than just a simple intrusion.
According to the official, the attackers also compromised the systems of a number of private firms, including the government contractor Dyn.
The agency has been using the Dyn platform to handle information sharing between government and private companies.
The company said in an e-mail that it had “continued to investigate the matter.”