PORTLAND, Ore. (AP) — The FBI says it’s helping the Portland Police Bureau in an investigation into a video posted on social media that includes a threat of violence against Portland Mayor Ted Wheeler if he does not resign. Oregon Public Broadcasting reports an anonymous account posted the video on Twitter Wednesday. In it, an unidentified masked narrator says they are speaking on behalf of a “small collective from within the anarchist and anti-fascist community.” The person alleges that the mayor has blood on his hands and next time it might be his own. In a statement, the FBI encouraged anyone with information about the video’s creators to contact either the FBI or police.