The Federal Bureau of Investigation has determined that Iran is responsible for an online attempt this month to incite violence against FBI Director Chris Wray and federal and state officials who pushed back on election-fraud claims advanced by President Trump and some of his supporters, according to people familiar with the matter.

A website called “Enemies of the People” and some associated social- media accounts surfaced about two weeks ago that alleged Mr. Wray and about a dozen officials had engaged in treason because they “aided and abetted the fraudulent election against” Mr. Trump.

The website, which is no longer online, featured crosshairs over photos of people it said should be targeted for reprisal because they defended the election result declaring President-elect Joe Biden the winner as legitimate. It also included photos of homes and street addresses where the individuals lived as well as personal email addresses.