“Due to the recent increase in ICE enforcement actions across the country, criminal actors are using ICE’s enhanced public profile and media coverage to their advantage to target vulnerable communities and commit criminal activity. This not only effects the victims and communities but also has broader negative consequences on law enforcement agencies.”

“These criminal impersonations make it difficult for the community to distinguish between legitimate officers conducting lawful law enforcement action and imposters engaging in criminal activity, which damages trust between the local community and law enforcement officers.”

I don't see the FBI bulletin posted on their website yet, but Property of the People has lots of other good documents of interest that they've obtained through FOIA.