On Saturday, the hackers compromised a Federal Bureau of Investigation email system and sent tens of thousands of messages warning of a possible cyber attack, according to the agency and security specialists.
The fake emails appeared to come from a legitimate FBI email address ending in @ ic.fbi.gov, the FBI said in a statement.
Although the hardware affected by the incident “was taken offline quickly after the problem was discovered,” the FBI said, “This is an ongoing situation.”
Hackers have sent tens of thousands of emails warning of a possible cyber attack, threat monitoring organization Spamhaus Project said on its Twitter account.
A copy of an email posted by Spamhaus on Twitter showed “Urgent: Threat Actor in Systems” as the subject and appeared to end with an approval from the Department of Homeland Security.
The FBI is part of the Justice Department.
Bloomberg News reported the incident on Saturday.
Both the FBI and the Cybersecurity and Infrastructure Security Agency are aware of the incident, the FBI statement said.
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