Sir Keir Starmer has said Britain stands with Israel and warned he is “deeply concerned” that the Middle East “is on the brink”.
In a televised address from Downing Street, the prime minister condemned an attack by Iran which saw around 200 missiles launched into Israel.
Follow latest: Iran attacks Israel
Sir Keir, who was on the phone with Israeli Prime Minister Benjamin Netanyahu when the assault was launched, said the rockets were aimed at civilian targets and it is “too soon to assess the impact fully”.
“I utterly condemn this attempt by the Iranian regime to harm innocent Israelis, to escalate this incredibly dangerous situation and push the region ever closer to the brink,” he said.
“We stand with Israel and we recognise her right to self-defence in the face of this aggression.”
Sir Keir called on Iran to “stop these attacks”, saying it had “menaced the Middle East for far too long”.
“I am deeply concerned that the region is on the brink, and I’m deeply concerned about the risk of miscalculation,” he added.
Israel has vowed “there will be repercussions” following the attack, which Iran said was in retaliation for the killing of Hezbollah leader Hassan Nasrallah in Lebanon last week.
Asked if the UK would be prepared to use British military capabilities to help Israel defend itself against Iran, which backs the militant group, the prime minister said: “This, as you’ll appreciate, is an evolving situation.
“But what I will say is that we stand with Israel and her right to self-defence. And any relevant updates will be provided in due course.”
Sir Keir also chaired a ministerial meeting in Downing Street on Tuesday on the situation in the Middle East.
The attack on Israel began while he was talking to the country’s Prime Minister Benjamin Netanyahu, Number 10 revealed earlier this evening.
Sir Keir would not go into details of the call, but said all his discussions with world leaders on the conflict focus on the need for a ceasefire and a political solution.
More from Sky News:
Why Israel could see this as a victory – analyst
Analysis: Israel could now choose to strike back
What is Iran’s axis of resistance?
Who was the Hezbollah leader killed by Israel?
“My calls have been about the importance of creating the space and the conditions for that de-escalation, and to find that political route forward,” the prime minister told reporters after his televised address.
He added that with Mr Netanyahu he was able to “make the case for a ceasefire in Gaza”, which has been under seige for the past year following the Hamas attacks on 7 October 2023.
The prime minister also repeated the advice for Britons in Lebanon to leave immediately, saying “we’re doing everything we can to get people out, but the situation is extremely volatile”.
“If you have the means to leave, the time is now,” he said.