The ransomware scourge has hit a computer system at the US Marshals Service.

Details are scant, but senior officials at the federal law enforcement agency have concluded the breach “constitutes a major incident,” the agency tells PCMag in a statement. NBC News was first to report the hack.

The agency uncovered the intrusion on Feb. 17, when it discovered “a ransomware and data exfiltration event affecting a standalone USMS system.” That means the hackers stole information from the computer while planting malicious code capable of encrypting the data inside.

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