The US has blocked a UN Security Council resolution proposing a ceasefire in Gaza as Israeli attacks result in the deaths of hundreds of Palestinians. The fighting has led to casualties in both Gaza and Syria, with the US also seeking approval to sell shells to Israel. The Palestinian Authority is calling for an end to the conflict and an international peace conference, while Saudi Arabia is urging urgent action to achieve a truce and provide essential supplies to Gaza. The UN and the White House have also expressed concern about the humanitarian situation in the region.