The FBI email server was apparently hacked on Friday night to send threatening spam emails to over 100,000 people, the agency said.

The emails warned receivers that their information may be under attack in connection with notorious cybersecurity group TheDarkOverlord. The FBI confirmed the incident on Saturday, but said the hacked systems were taken offline quickly.

“The FBI and CISA are aware of the incident this morning involving fake emails from an @ic.fbi.gov email account,This is an ongoing situation and we are not able to provide any additional information at this time.

The impacted hardware was taken offline quickly upon discovery of the issue. We continue to encourage the public to be cautious of unknown senders and urge you to report suspicious activity ic3.gov or cisa.gov.”

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A spike in email traffic from the fake warnings, which were sent out in two massive waves. The sender closed off with a “stay safe” from the US Department of Homeland Security’s Cyber Threat Detection and Analysis Group, which hasn’t existed for years.

The emails were sent from an FBI server and were received by publicly listed administrators of websites listed on the American Registry for Internet Numbers.TheDarkOverlord unsuccessfully attempted to hold Netflix to ransom in 2017 after stealing all of its videos including unreleased content and putting them online as torrents