Federal investigators confirmed a major intrusion into FBI surveillance support systems attributed with medium confidence to a China-linked state-sponsored actor, with the compromised system holding sensitive data related to active investigations, confidential sources, and technical collection methods. No CVE, attack vector, or public IOCs have been released; MITRE techniques consistent with the incident profile include T1005, T1119, T1213, T1078, and T1567, characteristic of long-dwell-time, data-focused state collection operations. Organizations with law enforcement data-sharing relationships, classified partnerships, or personnel involved in federal investigations should immediately audit trust relationships and network connectivity to FBI or DOJ systems, enforce MFA on all privileged accounts with access to sensitive data repositories, and review behavioral detection coverage for bulk data access and exfiltration patterns in the absence of confirmed IOCs.