(CNN)The Iranian hackers suspected of posing as the Proud Boys and sending threatening emails to potentially thousands of American voters accessed voter registration data in at least one state, US federal officials said Friday evening.
The hackers had posted a video online last week that purported to show they had access to information about American voters.
The FBI and the government's cybersecurity agency, Cybersecurity and Infrastructure Security Agency, said Friday that the Iranians had "obtained voter registration data in at least one state."
Some threatening emails that were sent last week to voters in multiple states, including Florida and Alaska, read, "You will vote for Trump on Election Day or we will come after you."
"Unlike the U.S., Iran does not interfere in other country's elections. The world has been witnessing U.S.' own desperate public attempts to question the outcome of its own election at the highest level," Alireza Miryousefi, the press officer for Iran's mission to the UN, wrote on Twitter.