Some Iranians have formed human chains on bridges and outside power plants after authorities urged people to gather at potential US and Israeli targets.
It comes after Donald Trump threatened to attack Iran's civilian infrastructure.
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.
As Cuba struggles with power cuts, how is the island holding up?
The BBC's Will Grant reports from the island days after the entire national electric grid collapsed.
Venezuelans in Miami and Caracas celebrate historic WBC victory over USA
Venezuela won its first-ever World Baseball Classic title, defeating the United States 3–2 in the championship game.
Watch: Sean Penn receives 'Oscar' in Ukraine after skipping US ceremony
The Academy Award winning US actor won his third Oscar on Sunday, but skipped the ceremony to visit Ukraine.
Why did only two Iranian football players stay in Australia?
After Australia gave humanitarian visas to seven team members, only two decided to stay - the BBC's Katy Watson explains what happened.
'A new norm': BBC visits Doha market starting to fill up again two weeks into Iran war
The BBC's International News correspondent, Barbara Plett Usher, visits Doha's Souq Waqif market as strikes in the region continue.
Oscar buzz for Ray and his Retirement Plan
Voiced by Domhnall Gleeson and directed by John Kelly, Retirement Plan is nominated for Best Animated Short Film at the 98th Academy Awards.
Watch: Why Kharg Island is a lifeline for Iran
BBC Security Brief's Mikey Kay breaks down why Kharg Island is so strategically important for Tehran.
Justified or not? US military families on fears of Iran war
BBC's North America editor Sarah Smith spoke to Gold Star mum Lynn, whose son died in the Iraq War, and veteran Jeremy.
'I don't know why we're doing it' - Americans divided on Iran war
Ten days since President Trump first announced the attack, people from across the US tell the BBC what they think the best outcome of the conflict could be.
HMS Dragon sets sail from Portsmouth and heads to Cyprus
The UK has deployed the Type 45 Destroyer to the Mediterranean region, after an Iranian drone struck the runway at the RAF Akrotiri base in Cyprus on 1 March.
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