Americans speaking out against artificial intelligence data centers on social media are falling under police surveillance, a confidential law enforcement bulletin obtained by The Intercept reveals.

A fusion center in Philadelphia combed through spicy internet comments from AI critics and concluded there is a growing risk of physical violence against data centers from “domestic violent extremists,” ranging from white supremacists to anarchists.

“Domestic violent extremists (DVEs) are likely interested in targeting artificial intelligence (AI) data centers, posing a physical and cyber threat to infrastructure in the Philadelphia regional area,” the Delaware Valley Intelligence Center wrote in a December alert.

The fusion center distributed its warning, marked “for official use only,” through the national fusion center network of state, local, and federal police agencies.

Like many of the reports produced by fusion centers, the bulletin points to news reports and social media posts, but cites little in the way of tangible threats. It acknowledges “a lack of specific information on plans to target AI data centers in the Philadelphia area,” but warns law enforcement that three planned data center facilities in the region could become targets of future protests.