Britons have been warned not to travel to Israel as the conflict with Iran ramps up today.
The Foreign Office is now advising ‘against all travel to Israel and the Occupied Palestinian Territories’.
Planning is also believed to be under way to evacuate UK nationals if the situation deteriorates further.
The stark message came as Israel and Iran continued to bombard each other overnight.
Keir Starmer has announced that the UK is sending more RAF jets to the region amid the increasing hostilities.
Donald Trump has threatened a huge response if Tehran targets US bases or personnel in retaliation for Israel’s action.
The FCDO website warns that ‘travel insurance could be invalidated’ if people travel against the advice, and described the current status as a ‘fast-moving situation that poses significant risks’.
Chancellor Rachel Reeves insisted this morning deploying extra jets does not mean the UK is ‘at war’.
Additional refuelling aircraft have been deployed from UK bases and more fast Typhoon jets will be sent over, it is understood.
The Chancellor suggested the UK could ‘potentially’ support Israel in fending off Iranian strikes – as has happened before.
Asked whether the move by the PM means the UK is at war, Ms Reeves told Sky News: ‘No, it does not mean that we are at war.
‘And we have not been involved in these strikes or this conflict, but we do have important assets in the region and it is right that we send jets to protect them and that’s what we’ve done.
‘It’s a precautionary move.’
Oil prices have surged after Israel’s initial strikes against Iran’s nuclear programme, sparking fears of increasing prices in the UK.
The Chancellor told the BBC that there is ‘no complacency’ from the Treasury on the issue and ‘we’re obviously, monitoring this very closely as a government’.
Sir Keir has declined to rule out the possibility of intervening in the conflict entirely, and the Chancellor indicated on Sunday that the UK could ‘potentially’ support Israel in the future.
Britain last announced it had deployed fighter jets in the region in last year, when the Government said British aircraft had played a part in efforts to prevent further escalation.
Asked whether the UK would come to Israel’s aid if asked, the Chancellor told Sunday Morning With Trevor Phillips: ‘We have, in the past, supported Israel when there have been missiles coming in.
‘I’m not going to comment on what might happen in the future, but so far, we haven’t been involved, and we’re sending in assets to both protect ourselves and also potentially to support our allies.’
Pushed again on whether the UK would deploy assets in support of Israel if asked, she said: ‘What we’ve done in the past (…) is help protect Israel from incoming strikes.
‘So a defensive activity.’
She added: ‘I’m not going to rule anything out at this stage (…) it’s a fast moving situation, a very volatile situation.’
Iranian state media said Tehran could target US, UK and French bases in the region if the countries help Israel thwart Iran’s strikes.
Shadow chancellor Mel Stride backed the Government’s decision to send further RAF jets to the region, telling the BBC it is the ‘right thing’ to do.
He told the BBC: ‘We’ve got assets out there in the UAE, Oman, Cyprus, they need to be protected given that Iran has suggested they may be under threat.’