Keir Starmer pleaded for calm today after Israeli strikes on Iran sparked fears over all-out war.
The PM has urged both sides to 'step back' after Israel launched raids, insisting its regional rival cannot be allowed to develop nuclear weapons.
Operation Rising Lion, involving more than 200 Israeli jets, targeted a facility in Natanz and the capital Tehran.
There are claims Islamic Revolutionary Guard Corps Commander Hossein Salami was killed in the strikes.
Iran's Supreme Leader Ayatollah Ali Khamenei has warned Israel should expect 'severe punishment' in response.
