Sri Lanka, April 12 -- Sir Keir Starmer has urged the US and Iran "to find a way through" after the failure of peace talks, as he also called for the fragile ceasefire to continue and warned against any further escalation.

The Prime Minister discussed Washington and Tehran's negotiations with the Sultan of Oman after the two sides' 21-hour session in Pakistan ended without an agreement in the early hours of Sunday.

US Vice-President JD Vance left Islamabad without a deal, pointing to Iran's refusal to commit to not build a nuclear weapon, leaving uncertainty over the shaky two-week truce.

In a readout of Sir Keir's call with His Majesty Sultan Haitham bin Tarik al Said, a Downing Street spokeswoman said: "They discussed the peace talks...