After the killing of Hezbollah leader Hassan Nasrallah by a targeted airstrike, Israeli army chief Herzi Halevi indicated the possibility on Saturday of an incursion into neighbouring Lebanon. He said that he had completed an assessment of the situation and approved plans for the Northern Command of the armed forces at the command’s headquarters in the northern Israeli city of Safed. “Challenging days lie ahead of us,” he added in a video released by the army. The Israeli army was “on high alert, both defensively and offensively, on all fronts,” he said, adding they were prepared for what come…