United Nations Secretary-General António Guterres on Sunday denounced Israel’s killing of Palestinian civilians in Gaza, labelling it “heartbreaking”, and called it unacceptable to resist statehood for the Palestinian people. “Israel’s military operations have spread mass destruction and killed civilians on a scale unprecedented during my time as secretary-general,” Guterres said at the opening of a summit of the G77+China in the Ugandan capital Kampala. “This is heartbreaking and utterly unacceptable. The Middle East is a tinder-box, we must do all we can to prevent conflict from igniting acr…