The UK government has withdrawn its staff from Iran.
It said the temporary precautionary measure has been taken due to the ongoing security situation.
At the US embassy in Jerusalem, non-emergency US staff and family have been told to leave Israel due to safety risks.
The embassy said on Friday that the US government may implement further restrictions on US personnel in Israel and advised its citizens to consider leaving while they can.
“Persons may wish to consider leaving Israel while commercial flights are available,” it said.
Britain’s foreign office also provided an update on Friday, with the travel warnings providing one of the strongest indications yet that a regional conflict could be imminent.
“Due to the ongoing security situation, we have taken the precautionary measure to temporarily withdraw UK staff from Iran,” the UK government foreign travel advice website said.
“Our embassy continues to operate remotely.”
The UK does not appear to have withdrawn any staff from Israel, but continues to advise against travel to parts of the country over security concerns.
The warning comes a day after talks between the US and Iran over its nuclear programme ended without an agreement.
Donald Trump set out his case for a possible attack on Iran in his State of the Union speech on Tuesday.
The US president said while he preferred a diplomatic solution, he would not allow Tehran to obtain a nuclear weapon.
Mr Trump has previously threatened to take military action against Iran if a deal is not reached.
The US has spent the last month amassing a fleet of aircraft and warships in the region.
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