Israel's airforce killed at least 58 Palestinians in new attacks on Gaza overnight, local health authorities said on Saturday, as the country appeared set to press ahead with a new ground offensive. More than 300 Gazans have been killed in Israeli strikes since Thursday, according to local health authorities, one of the deadliest phases of bombardment since a truce collapsed in March. The latest strikes came after U.S. President Donald Trump ended his Middle East tour on Friday with no apparent progress towards a new ceasefire.