Iranian hackers sought to interest President Joe Biden’s campaign in information stolen from rival Donald Trump’s campaign, sending unsolicited emails to people associated with the then-Democratic candidate in an effort to interfere in the 2024 election, the FBI and other US agencies have said. The FBI confirmed on 12 August that it was investigating a complaint from Donald Trump’s presidential campaign that Iran had hacked and distributed a trove of sensitive campaign documents. On 19 August intelligence officials confirmed that Iran was behind the hack. There’s no indication that any of the recipients in Biden’s campaign team responded, officials said on Wednesday, and several media organisations approached over the summer with leaked stolen information have also said they did not respond. Kamala Harris’ presidential campaign called the emails from Iran “unwelcome and unacceptable malicious activity” that were received by only a few people who regarded them as spam or phishing attempts. The emails were received before the hack of the Trump campaign was publicly acknowledged, and there’s no evidence the recipients of the emails knew their origin. The announcement is the latest US government effort to call out what officials say is Iran’s brazen, ongoing work to interfere in the election, including a hack-and-leak campaign that the FBI and other federal agencies linked last month to Tehran. Iran has denied interfering in US affairs. On Wednesday its permanent mission to the United Nations in New York said the latest allegations were “fundamentally unfounded, and wholly inadmissible.” US officials in recent months have used criminal charges, sanctions and public advisories to detail actions taken by foreign adversaries to influence the election, including an indictment targeting a covert Russian effort to spread pro-Russia content to US audiences. It’s a stark turnaround from the government’s response in 2016, when Obama administration officials were criticised for not being forthcoming about the Russian interference they were seeing on Trump’s behalf as he ran against Hillary Clinton. In this case, the hackers sent emails in late June and early July to people who were associated with Biden’s campaign before he dropped out. 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 statement released by the FBI, the Office of the Director of National Intelligence and the Cybersecurity and Infrastructure Security Agency. The agencies have said the Trump campaign hack and an attempted breach of the Biden-Harris campaign are part of an effort to undermine voters’ faith in the election and to stoke discord. The Trump campaign disclosed on 10 August that it had been hacked and said Iranian actors had stolen and distributed sensitive internal documents. At least three news outlets – Politico, The New York Times and The Washington Post – were leaked confidential material from inside the Trump campaign. So far, each has refused to reveal any details about what it received. It has been reported that among the documents was a research dossier that the Trump campaign had done on the Republican vice-presidential nominee, JD Vance. In a statement, Harris campaign spokesperson Morgan Finkelstein said the campaign has cooperated with law enforcement since learning that people associated with Biden’s team were among the recipients of the emails. Trump’s campaign said the leaks was “further proof the Iranians are actively interfering in the election” to help Harris. Intelligence officials have said Iran opposes Trump’s reelection, seeing him as more likely to increase tension between Washington and Tehran. Trump’s administration ended a nuclear deal with Iran, reimposed sanctions and ordered the killing of Iranian Gen. Qassem Suleimani, an act that prompted Iran’s leaders to vow revenge. Iran’s intrusion on the Trump campaign was cited as just one of the cyber-attacks and disinformation campaigns identified by tech companies and national security officials at a hearing Wednesday of the Senate Intelligence Committee. Executives from Meta, Google and Microsoft briefed lawmakers on their plans for safeguarding the election, and the attacks they’d seen so far. “The most perilous time I think will come 48 hours before the election,” Microsoft president Brad Smith told lawmakers during the hearing, which focused on American tech companies’ efforts to safeguard the election from foreign disinformation and cyber-attacks.