Iran carried out a cyber attack on the British parliament during the summer that affected some 9,000 email accounts.
The accounts that were hit include those belonging to Prime Minister Theresa May and other cabinet ministers, according to the Times, which based its report on a secret intelligence assessment. The attack, which was initially blamed on Russia, took place on June 23.
The revelation comes as May and other international leaders are trying to convince Washington not to abandon the Iran nuclear deal.
On Friday, U.S President Donald Trump said he will decertify the 2015 Iran agreement, because he believes Teheran has committed multiple violations of the deal. He kicked a decision over whether to restore sanctions back to Congress.
May, along with German Chancellor Angela Merkel and French President Emmanuel Macron, issued a joint statement in which they declared that they are committed to the Iran deal and its full implementation. They urged Trump and Congress to consider the implications to the security of the U.S. and its allies.
The parliament attack is believed to be Iran’s first significant act of cyberwarfare on Britain, according to the Times. During the 12-hour attack, a computer program bombarded parliamentary email accounts. None of May’s emails was at risk because she uses a secure Downing Street account, not her parliamentary one.
An investigation by the National Cyber Security Centre (NCSC) and the National Crime Agency is continuing. An NCSC spokesperson said: “It would be inappropriate to comment further while inquiries are ongoing.”