An Iranian propaganda campaign created fake Bernie Sanders supporters online, Facebook disclosed Tuesday.

In a press release, the social-media giant said it had removed 652 pages associated with political-influence campaigns traced to Iran, including coordinated inauthentic behavior that originated in Iran and targeted people across multiple internet services in the Middle East, Latin America, U.K., and U.S.”

The cybersecurity company FireEye, which first alerted Facebook to the influence campaign months ago, wrote in a separate posting on its site that it had traced the campaign—including posts from supposed “American liberals supportive of U.S. Senator Bernie Sanders”—to Iran through email addresses and phone numbers associated with the “inauthentic” accounts.

The investigation began with FireEye’s discovery of a fake U.S. news outlet called Liberty Front Press, which Facebook says was created in 2013. The actors behind that site over time branched out into different personas intended to appeal to different audiences including “anti-Saudi, anti-Israeli, and pro-Palestinian themes.” Examples included accounts like The British Left, which published content in support of U.K. Labour party leader Jeremy Corbyn, and the pro-Palestinian Patriotic Palestinian Front. FireEye also says it “identified multiple Arabic-language, Middle East-focused sites” as part of the effort.

Unlike the Russian cyberinfluence campaign in 2016, FireEye didn’t find a complementary hacking campaign attached to the propaganda activity. Iran has spent big on developing its offensive online capabilities, but FireEye said it found no links to APT35—a hacking group that has targeted U.S. defense companies and Saudi energy firms. Instead, the security firm found links between the campaign and Iran’s state-run TV propaganda channel, PressTV.

The Iranian actors behind the campaign expanded beyond Facebook and Instagram and onto Twitter, according to FireEye. In a separate statement late Tuesday, Twitter announced it had suspended 284 accounts for what it said was “coordinated manipulation” and that “it appears many of these accounts originated from Iran.”

The Daily Beast recovered tweets from what appears to be an account associated with the campaign. @libertyfrontpr has since been deleted, but Google cache results show it linked back to the LibertyFrontPress.com website FireEye attributed to be part of the propaganda effort. The account was active as of at least Tuesday and is not listed as suspended on the platform.

The account used hashtags like “#Resist” and #NotMyPresident when tweeting out anti-Trump sentiments. It also weighed in against the Supreme Court nomination of Judge Brett Kavanaugh. “The #Senate has a responsibility to reject any nominee who would fail to be a fair-minded constitutionalist. That is #BrettKavanaugh. We must #StopKavanaugh.”

In a rare move for Holocaust-denying Iranian propaganda, @libertypr slammed the Republican Party for allowing anti-Semite and Holocaust denier John Fitzgerald to run for a seat in the California legislature.

In addition to the U.S. themes, Liberty’s Twitter account also targeted opponents of the Iranian government, including the Mujahedeen Khalq exile group, or MEK, which advocates the overthrow of Iran’s clerical government, with hashtags like “#BanTerrorOrg.”

The takedown marks the second time since the 2016 election that Facebook has appeared to act without U.S. government pressure to stop an alleged political-influence campaign. In late July, Facebook took down a handful of sock-puppet accounts purporting to be black, Hispanic, and #Resistance activists. Facebook didn’t attribute that campaign to a specific country or group, but it did note that some of the accounts had links to the infamous Russian Internet Research Agency troll farm.

Facebook said Tuesday that it had taken down the new batch of pages only after waiting “many months” after being alerted to the campaign by FireEye. The delay allowed the company to further investigate the campaign and improve its defenses against future efforts.