Israel and Hezbollah agreed a ceasefire on Friday, a US official said, after deadly exchanges between the two sides in Lebanon put a deal to end the Middle East war under strain less than two days after it was signed. Talks that were scheduled for Friday between the US and Iran in Switzerland to take the deal to the next stage were postponed amid the fighting, with no new date announced. Tehran’s top negotiator warned it would not bend on its red lines and that its finger was still “on the...