evidence: Twenty-five percent of Americans say it is "probably" or "definitely" true that the FBI instigated the Jan. 6, 2021, attack on the U.S. Capitol, a false concept promoted by right-wing media and repeatedly denied by federal law enforcement, according to a new Washington Post-University of Maryland poll. [...] Debunked rhetoric about the Jan. 6 attack has not been limited to the FBI conspiracy theory. Some have alleged that anti-Trump antifa instigated the riot or that police were complicit in the building breach, fueling calls for the release of Capitol surveillance footage from that day that in turn re-energized claims of FBI involvement. Partisan divisions over Jan. 6 are clear in the poll. Almost 8 in 10 Democrats (77 percent) say that those who entered the Capitol were "mostly violent," compared with 18 percent of Republicans, down slightly from 26 percent in 2021. About 140 police officers were assaulted on Jan. 6 at the Capitol, federal authorities have said, and more than 90 people have already been sentenced for felony assaults on law enforcement caught on video, with many similar cases still pending, according to a Post database.