The United Nations has called for an immediate ceasefire to end “epic suffering” in the Gaza Strip after Israeli airstrikes reportedly killed more than 700 people in a single day and hospitals began to shut down for lack of fuel. The UN secretary general, António Guterres, said on Tuesday that the bombardment and blockade of Gaza amounted to the “collective punishment of the Palestinian people” and violated international law, comments that sparked a fierce row with Israel. “To ease epic suffering, make the delivery of aid easier and safer and facilitate the release of hostages. I reiterate my appeal for...