A US blockade of Iran's ports has began on Monday after peace talks between the two countries ended without a deal over the weekend.
In a social media post, US President Donald Trump warned that any Iranian "fast attack ships" caught trying to approach the blockade "will be immediately ELIMINATED".
But what will the blockade do and what are its risks? The BBC's security correspondent Frank Gardner explains how it will work and its potential impacts across the globe.
Frank Gardner: Why China keeps cropping up in Iran war stories
BBC Security Correspondent Frank Gardner explains how the world's second-largest economy fits into the Gulf conflict.
IMF: Oil prices and war could derail global growth
The BBC’s Michelle Fleury explains why oil, inflation and interest rates are key risks as the IMF warns war and soaring energy prices could hit the global economy.
US drivers head to Native American lands for cheaper gas
Some of the cheapest fuel in the country can be found on tribal land due to tax exemptions.
'I'm not a fan of Pope Leo' says Trump
President Donald Trump launched the attack on Pope Leo after the pontiff criticised the war in Iran.
Iran chose 'not to accept our terms', US VP Vance says after negotiations
The US vice-president made the announcement after 21 hours of negotiations in Islamabad, Pakistan.
BBC's Ione Wells: What has the US actually achieved in Iran?
US President Donald Trump said the US had won a 'total and complete victory' after announcing a two-week ceasefire with Iran. The BBC's Ione Wells on what's next for the US and the region.
Americans react to Trump's 'a whole civilisation will die tonight' warning
The US president issued the warning to Iran if it does not reach a deal on reopening the Strait of Hormuz by his deadline.
Iranians form human chains at bridges and power plants
Tehran had urged people to gather outside potential US and Israeli targets after Donald Trump threatened to attack civilian infrastructure.
What we know so far about the search for missing US airman in Iran
US and Iranian forces are searching for a missing American crew member after a US warplane was shot down.
Video appears to show US plane and search and rescue helicopters over southern Iran
Reports from the US, quoting unnamed officials, say a search is under way after the shooting down of a US fighter jet over Iran.
Ros Atkins on…the cost of the Iran war
The BBC's Analysis Editor Ros Atkins takes a closer look at US costs as it continues its war with with Iran.
Watch: Trump's shifting deadlines for ending Iran war
The BBC's chief international correspondent analyses the US President's latest White House address.
Trump says US 'on the cusp' of ending Iran war in televised address
The president also called on countries reliant on the Strait of Hormuz to 'build up the courage' to secure it.
Expectant mothers in Cuba struggle under fuel blockade
The BBC's Will Grant speaks to two women experiencing starkly different realities as the country's energy crisis impacts their pregnancies.
One month in, what do American conservatives make of the war in Iran?
Attendees at the annual CPAC conference in Texas are conflicted about Operation Epic Fury, which was launched by the US and Israel on 28 February.
What happened at Maduro's second court appearance
The BBC was in the New York courtroom to watch the ex-Venezuelan leader argue for ability to fund his defence with Venezuelan government funds.
How is the Philippines reacting to its energy emergency?
BBC News Asia Business Correspondent Suranjana Tewari reports from a petrol station in Manila.
BBC in Cuba as island plunged into darkness
More than 10 million people are enduring power cuts after Cuba's national electrical grid collapsed again.
Ros Atkins on... Trump's mixed messages on the war
The BBC’s Analysis Editor looks at President Trump’s mixed messages on the war with Iran.
Trump compares attack on Iran to Pearl Harbor in meeting with Japanese PM
In a meeting with Japanese Prime Minister, US President Donald Trump was asked why he didn't inform allies about his plan to attack Iran.
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