Britain's Foreign Ministry withdrew embassy staff from Iran on Wednesday, following US President Donald Trump threatening to "bomb and destroy" Iranian infrastructure.
The UK government website explained that "Due to the ongoing security situation, we have taken the precautionary measure to temporarily withdraw UK staff from Iran," adding that "UK government support is extremely limited in Iran."
Earlier on Wednesday, Trump threatened that "any time the Islamic Republic of Iran shoots at a ship in the Strait of Hormuz, whether it be by Missile, Rocket, Drone, or any other device or weapon, the United States will bomb and destroy ONE BRIDGE OR POWER PLANT," in a post on Truth Social.
The UK government website explained that "the situation in the Middle East remains unpredictable. Since 8 July there have been strikes and retaliatory attacks by Iran in a number of locations across the region against US military and civilian infrastructure.
"There is a risk of more attacks and unforeseen escalation in the region."
Israel is no longer on the UK's 'no travel list'
The Foreign, Commonwealth, and Development Office (FCDO) removed Israel from the UK's "no travel" list in June following a year of advising "against all travel."
The FCDO still advised against travel to Gaza, the Gaza envelope, parts of the West Bank, and northern Israel.
On Wednesday it updated the guidance to warn about "regional tensions, including information about recent strikes and retaliatory attacks by Iran."
The advice noted that "the Iranian regime had stated its intention to target locations associated with the US and Israel, including organizations, businesses, facilities, and institutions."
"British nationals currently in the Middle East should be prepared for possible flight cancellations, periodic airspace closures, and potential travel disruptions," the FCDO concluded.