The notice also said the "affected" system contained "returns from legal process, such as pen register and trap and trace surveillance returns, and personally identifiable information pertaining to subjects of FBI investigations."
Pen register and trap and trace devices allow law enforcement to monitor calls made to or from a specific phone, or websites visited by an internet-connected device. While these tools do not record the content of those communications, the information captured is valuable to foreign intelligence services or organized criminal groups because it could reveal the targets of FBI surveillance or criminal probes...
https://www.politico.com/news/2026/04/01/fbi-hack-surveillance-system-major-incident-00854237

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