Iran cyberattack targeted UK Prime Minister's email

Houses of Parliament London UK Big Ben

According to intelligence officials, the cyberattack "bombarded parliamentary email accounts" but only compromised about 1 percent of the accounts it affected.

Initial suspicion for the attack fell on Russian Federation, but this has now been discounted.

Email accounts belonging to Prime Minister Theresa May and dozens of cabinet ministers and members of parliament were targeted in a large cyber attack June 23.

The Daily Telegraph, citing sources within Whitehall, said intelligence officials had concluded that Tehran was responsible for the attack in June, which lasted more than half a day.

The revelation comes as May and other global leaders are trying to convince Washington not to abandon the Iran nuclear deal.

Investigators have traced the source of the attack to the Tehran regime, according to reports. "It appears to have been state-sponsored", adding that "the nature of cyberattacks means it is notoriously hard to attribute an incident to a specific actor". "It is possible they were simply testing their capability". A National Cyber Security Centre spokesman said it would be "inappropriate to comment further while enquiries are ongoing".

But it is a sign that Iran is becoming "more aggressive and capable as a cyber power", he added. The Iranian government also had no immediate comment.

The U.K. and other European countries involved in the agreement warned the USA on Friday against moves that would harm the Iran nuclear deal, known as the Joint Comprehensive Plan of Action.

May, along with German Chancellor Angela Merkel and French President Emmanuel Macron, issued a joint statement Friday night calling the deal "the culmination of 13 years of diplomacy".

"We encourage the USA administration and Congress to consider the implications to the security of the USA and its allies before taking any steps that might undermine the accord", the trio said. The reason for the attack is not yet known, but the report said the hackers were not after a simple financial profit.

"We stand committed to the [Joint Comprehensive Plan of Action] and its full implementation by all sides", the three leaders said, adding that preserving the agreement "is in our shared national security interest".

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