Last week Iran said it would exceed internationally agreed limits on its nuclear programme. Mr Trump has said he does not want war with Iran, but warned the country would face "obliteration" if conflict broke out.
The attack had been planned for several weeks, the sources told US media outlets, and was suggested as a way of responding to the mine attacks on tankers in the Gulf of Oman. Both the Washington Post and AP news agency said the cyber-attack had disabled the systems.
The New York Times said it was intended to take the systems offline for a period of time. Christopher Krebs, the director of the Cybersecurity and Infrastructure Security Agency, said "malicious cyberactivity" was being directed at US industries and government agencies by "Iranian regime actors and their proxies". They were using "destructive 'wiper' attacks", he said, using tactics such as "spear phishing, password spraying and credential stuffing" in a bid to take control of entire networks.
Iran has also been trying to hack US naval ship systems, the Washington Post reported. He hasn't commented on the cyber-attack reports. On Friday he said he had pulled out of launching conventional strikes on Iran because he had been told that Iranians would be killed.
Iran has always insisted its nuclear programme is for purely peaceful purposes. Iran nuclear crisis: The basics. World powers don't trust Iran: Some countries believe Iran wants nuclear power because it wants to build a nuclear bomb - it denies this. So a deal was struck: In , Iran and six other countries reached a major agreement.
Iran would stop some nuclear work in return for an end to harsh penalties, or sanctions, hurting its economy. What is the problem now? Iran re-started banned nuclear work after former US President Donald Trump pulled out of the deal and re-imposed sanctions on Iran. Even though new leader Joe Biden wants to rejoin, both sides say the other must make the first move. Clock ticking. He has a bleak assessment of the latest developments. Image source, Getty Images.
An Israel-Iran war would almost certainly also involve pro-Iranian militant groups from around the region. Covert actions. Iranian officials have spoken of Iran's nuclear programme as a matter of national pride. Image source, Reuters. Iran said an explosion at its Natanz nuclear facility in July was the result of "sabotage".
Proliferation fear. The BBC is not responsible for the content of external sites. Under the original deal, Iran said it would curb its nuclear ambitions in return for other countries lifting economic sanctions. The agreement collapsed when the US pulled out in , but President Joe Biden has said it could rejoin.
Talks are set to resume in Vienna on 29 November after a four-month hiatus. Ahead of those talks, Iran's deputy foreign minister and lead negotiator, Ali Bagheri Kani, came to the UK Foreign Office to set out his country's demands.
At the meeting, Foreign Office Minister James Cleverly told his counterpart that Iran should take the opportunity of the new talks to conclude a deal that he said was already on table. The Iranians said merely the nuclear deal was discussed, without noting any specifics.
They want the focus of the Vienna negotiations to be on lifting sanctions, and getting guarantees from the United States that it will not pull out of the deal again. Video content. Posted at 23 Nov 23 Nov Posted at 16 Nov 16 Nov Posted at 11 Nov 11 Nov Posted at 3 Nov 3 Nov Posted at 19 Oct 19 Oct Posted at 7 Oct 7 Oct Posted at 12 Sep 12 Sep Posted at 27 Aug 27 Aug Posted at 2 Aug 2 Aug
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