Foreign Secretary David Lammy has said there is a "window" to achieve a diplomatic solution to the conflict between Israel and Iran.
Speaking after his meeting in Washington with secretary of state Marco Rubio and special envoy to the Middle East Steve Witkoff, Lammy said: "The situation in the Middle East remains perilous.
"We are determined that Iran must never have a nuclear weapon."
Lammy said the meeting saw them discuss "how a deal could avoid a deepening conflict," adding "a window now exists within the next two weeks to achieve a diplomatic solution".
Speaking on Thursday night, he said: "Tomorrow, I will be heading to Geneva to meet with the Iranian Foreign Minister alongside my French, German and EU counterparts.
"Now is the time to put a stop to the grave scenes in the Middle East and prevent a regional escalation that would benefit no one."