Leaders of Britain, France and Germany on Friday called for all sides to refrain from further escalation after Israeli strikes against nuclear and military facilities in Iran, British Prime Minister Keir Starmer's office said.

Iran has told the United States and UK that it could retaliate if the countries aid Israel in attacks amid fears the Middle East will descend into war.

Israel and Iran traded fire for a third straight day on Sunday, with rising casualties and expanding targets marking a sharp escalation in the conflict between the longtime adversaries.