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The US says it is “ready to engage without preconditions in serious negotiations” with Iran following the countries’ exchange of hostilities.
In a letter to the UN, the US justified its decision to kill top Iran Gen Qasem Soleimani as an act of self-defence.
Iran has retaliated by firing missiles at air bases housing US forces in Iraq causing no casualties. It also told the UN it was an act of self-defence.
Gen Soleimani was widely held as being Iran’s second most senior official.
As head of the Revolutionary Guards’ elite Quds Force, he was and architect of Iranian policy in the region.
Iran’s Supreme Leader Ali Khamenei described the missile attacks as a “slap in the face” for the US and called for an end to the American presence in the Middle East.
The US strike on Soleimani also killed members of Iran-backed Iraqi militias, who have also vowed revenge.
However, US Vice-President Mike Pence told CBS News that “intelligence” indicated that Iran had asked its allied militias not to attack US targets.
The US House of Representatives has scheduled a vote for Thursday on limiting President Donald Trump’s ability to wage war against Iran without specific approval from Congress.
What do the letters say?
In a letter to the UN Security Council, US Ambassador to the UN Kelly Craft said the US was ready to negotiate “with the goal of preventing further endangerment of international peace and security or escalation by the Iranian regime”.
The killing of Soleimani was justified, the letter argued, under Article 51 of the UN Charter, which requires states to “immediately report” to the Security Council any measures taken in exercising the right of self-defence.
The US would take additional action “as necessary” in the Middle East to protect its personnel and interests, the letter added.
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Iran also cited Article 51 as justification for its attack on US bases.
Iran’s UN Ambassador Majid Takht Ravanchi wrote that Tehran “does not seek escalation or war” after exercising its right to self-defence by taking a “measured and proportionate military response targeting an American air base in Iraq”.
“The operation was precise and targeted military objectives thus leaving no collateral damage to civilians and civilian assets in the area,” he wrote.
What did Mr Trump say about the Iranian strikes?
US President Donald Trump has previously threatened military action against Iran if it were to target US personnel and bases, but he did not announce any military action, saying Iran’s attack had caused no casualties.
“No Americans were harmed in last night’s attack by the Iranian regime,” he said.
“Iran appears to be standing down, which is a good thing for all parties concerned,” he added.
The US House of Representatives is expected to vote on Thursday on a resolution to force Mr Trump to halt further military action against Iran unless Congress gives it the all-clear.
“Members of Congress have serious, urgent concerns about the administration’s decision to engage in hostilities against Iran and about its lack of strategy moving forward,” Nancy Pelosi, speaker of the House, said in a statement.
What happened in the missile attacks?
A total of 16 missiles were launched from at least three sites in Iran, Defence Secretary Mark Esper said.
At least 11 of them struck the air base in Al Asad, west of Baghdad, and at least one more hit the Irbil base, he said.
Several other missiles landed at some distance from the targets.
The attacks happened at about 02:00 local time on Wednesday (22:30 GMT on Tuesday).
US Joint Chiefs of Staff Chairman Mark Milley said he believed early warning systems had prevented casualties.
“[What] I believe, based on what I saw and what I know, is that they were intended to cause structural damage, destroy vehicles and equipment and aircraft, and to kill personnel,” he said.
The attacks came just hours after the burial of Soleimani, who controlled Iran’s proxy forces across the Middle East.
It was the most direct assault by Iran on the US since the seizing of the US embassy in Tehran in 1979.
How did we get here?
The assassination of Soleimani took place on 3 January.
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The general was regarded as a terrorist by the US government, which says he was responsible for the deaths of hundreds of American troops and was plotting “imminent” attacks.
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Iran vowed “severe revenge” for his death. Mr Trump, meanwhile, warned the US would respond in the event of retaliation “perhaps in a disproportionate manner”.
Millions of Iranians turned out for the commander’s funeral, with mourners chanting “death to America” and “death to Trump”.
- Why huge crowds turned out for Soleimani’s funeral
- Voices from Iran: ‘Qasem Soleimani did not deserve such a fate’
A stampede at the burial in Soleimani’s hometown Kerman killed 50 people and injured 200 more on Tuesday.
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