Some Facebook groups that have promoted American “trucker convoys” similar to demonstrations that have clogged roads in Ottawa are being run by fake accounts tied to content mills in Vietnam, Bangladesh, Romania and several other countries, Facebook officials told NBC News on Friday.

The groups have popped up as extremism researchers have begun to warn that many anti-vaccine and conspiracy-driven communities in the U.S. are quickly pivoting to embrace and promote the idea of disruptive convoys.

Researchers at Harvard University’s Shorenstein Center on Media, Politics and Public Policy first noted that large pro-Trump groups had been changing their names to go with convoy-related themes earlier this week. Grid News reported on Friday that one major trucker convoy Facebook group was being run by a Bangladesh content farm.