Washington: US military cyber forces launched a strike against Iranian military computer systems on Thursday as President Donald Trump backed away from plans for a more conventional military strike in response to Iran's downing of a US surveillance drone, US officials have said.

Two officials told The Associated Press on Saturday that the strikes were conducted with approval from Trump. A third official confirmed the broad outlines of the strike. All spoke on condition of anonymity because they were not authorized to speak publicly about the operation.

The cyberattacks a contingency plan developed over weeks amid escalating tensions disabled Iranian computer systems that controlled its rocket and missile launchers, the officials said.

Two of the officials said the attacks, which specifically targeted Iran's Islamic Revolutionary Guard Corps computer system, were provided as options after Iranian forces blew up two oil tankers earlier this month.

The IRGC, which was designated a foreign terrorist group by the Trump administration earlier this year, is a branch of the Iranian military.

The action by US Cyber Command was a demonstration of the US' increasingly mature cyber military capabilities and its more aggressive cyber strategy under the Trump administration. Over the last year US officials have focused on persistently engaging with adversaries in cyberspace and undertaking more offensive operations.

There was no immediate reaction Sunday morning in Iran to the US claims. Iran has hardened and disconnected much of its infrastructure from the internet after the Stuxnet computer virus, widely believed to be a joint US-Israeli creation, disrupted thousands of Iranian centrifuges in the late 2000s.

Tensions have escalated between the two countries ever since the US withdrew last year from the 2015 nuclear deal with Iran and began a policy of "maximum pressure."

Iran has since been hit by multiple rounds of sanctions. Tensions spiked this past week after Iran shot down an unmanned US drone - an incident that nearly led to a US military strike against Iran on Thursday evening.

The cyberattacks are the latest chapter in the US and Iran's ongoing cyber operations targeting the other. Yahoo News first reported the cyber strike.

In recent weeks, hackers believed to be working for the Iranian government have targeted US government agencies, as well as sectors of the economy, including finance, oil and gas, sending waves of spear-phishing emails, according to representatives of cybersecurity companies CrowdStrike and FireEye, which regularly track such activity. This new campaign appears to have started shortly after the Trump administration imposed sanctions on the Iranian petrochemical sector this month.

It was not known if any of the hackers managed to gain access to the targeted networks with the emails, which typically mimic legitimate emails but contain malicious software.

Tensions have run high between the two countries since the US withdrew from the 2015 nuclear deal with Iran last year and began a policy of "maximum pressure." Iran has since been hit by multiple rounds of sanctions. Then Iran shot down an unmanned US drone this week.

"Both sides are desperate to know what the other side is thinking," said John Hultquist, director of intelligence analysis at FireEye. "You can absolutely expect the regime to be leveraging every tool they have available to reduce the uncertainty about what's going to happen next, about what the US' next move will be." CrowdStrike shared images of the spear-phishing emails with the AP.

One such email that was confirmed by FireEye appeared to come from the Executive Office of the President and seemed to be trying to recruit people for an economic adviser position. Another email was more generic and appeared to include details on updating Microsoft Outlook's global address book.

The Iranian actor involved in the cyberattack, dubbed "Refined Kitten" by CrowdStrike, has for years targeted the US energy and defense sectors, as well as allies such as Saudi Arabia and the United Arab Emirates, said Adam Meyers, vice president of intelligence at CrowdStrike.

The Department of Homeland Security said in a statement released Saturday that its agency tasked with infrastructure security has been aware of a recent rise in malicious cyber activities directed at US government agencies by Iranian regime actors and proxies.

Cybersecurity and Infrastructure Security Agency Director Christopher C. Krebs said the agency has been working with the intelligence community and cybersecurity partners to monitor Iranian cyber activity and ensure the US and its allies are safe.

The National Security Agency would not discuss Iranian cyber actions specifically, but said in a statement to the AP on Friday that "there have been serious issues with malicious Iranian cyber actions in the past."

"In these times of heightened tensions, it is appropriate for everyone to be alert to signs of Iranian aggression in cyberspace and ensure appropriate defenses are in place," the NSA said.

Iran has long targeted the US oil and gas sectors and other critical infrastructure, but those efforts dropped significantly after the nuclear agreement was signed. After Trump withdrew the US from the deal in May 2018, cyber experts said they have seen an increase in Iranian hacking efforts.

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New Delhi (PTI): The Congress Working Committee met here on Friday and adopted a resolution alleging the integrity of the entire electoral process was being severely compromised against which the party would soon launch a movement.

In the resolution of the top body of the Congress, the party said free and fair elections is a Constitutional mandate that was being called into "serious question by the partisan functioning of the Election Commission".

The CWC, which met amid the ongoing Winter Session of Parliament, said the session has been a washout so far because of the Narendra Modi government's "stubborn refusal" to have an immediate discussion on three pressing national issues -- "the recent revelations regarding corruption by a business group, and the violence in Manipur and Uttar Pradesh's Sambhal".

Asked why the Congress Working Committee (CWC) resolution does not name the business group, Congress leader Jairam Ramesh said, "The answer is the Adani group".

"The CWC believes the integrity of the entire electoral process is being severely compromised. Free and fair elections is a Constitutional mandate that is being called into serious question by the partisan functioning of the Election Commission.

"Increasing sections of society are becoming frustrated and deeply apprehensive. The Congress will take these up these public concerns as a national movement," the resolution stated.

Addressing a joint press conference along with Ramesh and Congress spokesperson Pawan Khera, party general secretary, organisation, K C Venugopal said the party discussed the political situation in the country for four-and-half hours and adopted the resolution.

He said the CWC has decided to constitute internal committees to look into electoral performance and organisational matters.

About the Assembly polls results in Maharashtra, Venugopal said the electoral outcome in the state was "beyond normal understanding and it appears to be a clear case of targeted manipulation".