Donald Trump has warned Iran that "time is running out" to negotiate a deal on its nuclear programme following the build-up of US military forces in the Gulf.
The US president said a "massive Armada" was "moving quickly, with great power, enthusiasm, and purpose" towards Iran, referring to a large US naval fleet.
In response, Iran’s Foreign Minister Abbas Araghchi said the country’s armed forces were ready "with their fingers on the trigger" to "immediately and powerfully respond" to any aggression by land or sea.
Iran insists its nuclear programme is entirely peaceful and has repeatedly denied accusations by the US and its allies that it is seeking to develop nuclear weapons.
Trump’s latest warning follows his promise that Washington would intervene to help those involved in the brutal and unprecedented crackdown on protests in the country earlier this month.
The US-based Human Rights Activists News Agency (HRANA) says it has confirmed the killing of more than 6,301 people, including 5,925 protesters, since the unrest began at the end of December. HRANA says it is also investigating another 17,000 reported deaths received despite an internet shutdown after nearly three weeks.
Another group, the Norway-based Iran Human Rights (IHR), has warned that the final toll could exceed 25,000.
Reeta Chakrabarti presents BBC News at Ten reporting by Caroline Hawley and Sarah Smith.
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