Officials said there is no evidence the Biden campaign solicited or responded to the emails.

The emails were sent in late June and early July to Biden’s campaign before the president dropped out of the race on July 21. The emails “contained an excerpt taken from stolen, non-public material from former President Trump’s campaign as text in the emails,” according to a U.S. government statement.

The cyber actors have continued to send emails to media organizations concerning Trump’s campaign, and publications have refused to publish the details.

“This malicious cyber activity is the latest example of Iran’s multipronged approach, as noted in the joint August statement, to stoke discord and undermine confidence in our electoral process,” the FBI said in the statement. “As the lead for threat response, the FBI has been tracking this activity, has been in contact with the victims, and will continue to investigate and gather information in order to pursue and disrupt the threat actors responsible.”

The agency noted that “Russia, Iran, and China are trying by some measure to exacerbate divisions in U.S. society for their own benefit, and see election periods as moments of vulnerability.”

“Efforts by these, or other foreign actors, to undermine our democratic institutions are a direct threat to the U.S. and will not be tolerated,” the agency concluded.