Britain said on Friday it had temporarily withdrawn its staff from Iran citing the security situation in the region.
U.S President Donald Trump briefly laid out his case for a possible attack on Iran in his State of the Union speech on Tuesday, underlining that while he preferred a diplomatic solution, he would not allow Tehran to obtain a nuclear weapon.
Britain's foreign office said its ability to assist British nationals was now extremely limited, with the embassy operating remotely and no in-person consular support available even in emergencies.
