The US president told Iranian leaders "the USA is watching" after anti-government protesters took to the country's streets over the weekend.
Western leaders have said there is evidence that the crash was caused by an Iranian missile but added that it could have been unintentional.
The US president said his administration would immediately impose new “punishing” economic sanctions “until Iran changes its behaviour”.
Nine crew members and 167 passengers died today when a Ukrainian International Airlines flight crashed moments after take off from Iran.
Mr Corbyn attacked Boris Johnson's response to escalating tension in Iran during Prime Minister's Questions.
Three Britons have died after a Ukrainian passenger plane crashed moments after take off from Iran, officials in Kyiv have confirmed.
Former Defence Secretary Sir Malcolm Rifkind thinks Iran could be planning more attacks on the US after the death of Qasem Soleimani.
Donald Trump has insisted "all is well", after Iran fired surface-to-surface missiles at two air bases in Iraq housing US troops.
Around 40 people are dead and more than 200 injured after a stampede broke out among mourners of the Iranian general, Iran state tv says.
The PM and Adel Abdul-Mahdi have agreed to “find a diplomatic way forward” in the wake of the death of Iranian general Qassem Soleimani.
Iran has vowed to take "severe revenge" after an Iranian general was assassinated in a US air strike at Baghdad airport.
The Prime Minister said he would not "lament" the death of Iranian general Qasem Soleimani, but called for "de-escalation from all sides".
Iranian military leader General Qassem Soleimani has been killed in an air strike in Baghdad ordered by US president Donald Trump.
An Iranian court has confirmed the arrest of scholar Kameel Ahmady following his detention in August.
A British-flagged oil tanker, the Stena Impero, is set to leave Iran after being detained there for 10 weeks.
The owners of the captured Stena Impero are calling on the UK government to ensure the safety of the vessel's 23-strong crew.
The government said it is "urgently" seeking information after reports a British-flagged oil tanker has been seized in the Strait of Hormuz near Iran.
Richard Ratcliffe said he does not know what treatment his wife is receiving after she was moved to a psychiatric ward on Monday.
President Donald Trump has signed an executive order targeting Iran's supreme leader and his associates with financial sanctions.
Donald Trump has revealed he was 10 minutes away from launching a missile against Iran.
Facebook said it has taken action on "coordinated inauthentic behaviour" originating from Iran, which included accounts posting about the royal family and US President Donald Trump.
The Church of England has criticised the Home Office after it quoted the Bible to question an asylum seeker's claim that he converted to Christianity because it is a peaceful religion.
Nazanin Zaghari-Ratcliffe's husband welcomed the granting of diplomatic protection to his imprisoned wife and said the move was a "clear signal" to Iran.
Foreign Secretary Jeremy Hunt has agreed Britain will grant "diplomatic protection" to Nazanin Zaghari-Ratcliffe, the British-Iranian mother held in Iran where she is accused of spying.
The husband of Nazanin Zaghari-Ratcliffe has said that she was threatened that it “would not be safe” if she did not agree to "spy" for the Iranians, as she begins a hunger strike in a prison in Iran.
The husband of imprisoned Nazanin Zaghari-Ratcliffe has said she is “gradually getting better” after speaking to her from her prison ward.
Richard Ratcliffe, the husband of imprisoned charity worker Nazanin Zaghari-Ratcliffe, praised Foreign Secretary Jeremy Hunt's efforts to help her case
Charity worker Nazanin Zaghari-Ratcliffe was jailed in Iran in 2016 after being accused of spying, and has been released for three days
The US president warned trading partners over Iran.
The husband of a charity worker jailed in Iran has said that Jeremy Hunt brings a “fresh start” to the campaign to free her after the “baggage” of Boris Johnson.
Nazanin Zaghari-Ratcliffe, 39, who was arrested and jailed in 2016, is accused of spreading propaganda against the Iranian regime.
The European nations urged US President Donald Trump not to pull out of the accord.
The President of the United States pulls out from the accord and has announced the highest level of economic sanctions on the state.
There has been almost a week of protests against the government, some of which have resulted in death
Protests in Iran have led to the deaths of 22 people
The mother is currently serving a five year jail term for allegedly plotting to overthrow government in the country, but she denies the claims
Richard Ratcliffe says he's confident Johnson is doing his best, but stops short of suggesting the Foreign Secretary's intervention will help his wife
The terms of the executive order - which places travel restrictions on eight countries - can be active while challenges to it are processed
The president of Iran's weightlifting federation has said the country has 'talented female athletes'
The Foreign Secretary is expected to discuss the idea of diplomatic protection with Richard Ratcliffe
More than 400 people are known to have died following the 7.3 magnitude earthquake
The Environment Secretary is weathering criticism in the wake of a BBC interview on Nazanin Zaghari-Ratcliffe
More than 300 people have been killed and thousands injured in the powerful 7.3-magnitude earthquake
Ratcliffe's wife, Nazanin, has been imprisoned in the country on accusations of plotting to overthrow the Iranian regime
Senator Sam Dastyari was called a 'monkey' and 'terrorist' by white supremacist group Patriot Blue
The husband of the woman imprisoned in Iraq spoke to Paul Ross and Carole Malone about her situation and how the Foreign Secretary may have impacted it
The Foreign Secretary suggested Nazanin Zaghari-Ratcliffe had been training journalists at the time of her arrest, which Iranian TV claims was an admission of guilt
The Foreign Secretary's meetings in Washington come amid ongoing firestorm over comments made about a woman imprisoned in the country
Campaigns director at Amnesty International UK, Kerry Moscogiuri, is calling on the public to encourage to government to work on releasing Nazanin Zaghari-Ratcliffe
Some claim Boris Johnson's comments on Nazanin Zaghari-Ratcliffe could increase her sentence in Iran
Iran's foreign minister Javad Zarif claims Washington is attempting to 'whitewash' the role of US allies
Users in Europe, as well as India and as far as Mozambique, reported they had no service on the messaging system