The United States is working urgently on a plan to mediate a ceasefire between Israel and Hezbollah, according to three sources familiar with the matter, as officials eye with deepening concern the prospects of a widening conflict.

Yesterday, after Netanyahu left for New York, where he is expected to address the UN General Assembly this afternoon at about 4:30 p.m. ET, his office issued another statement saying that the Israeli prime minister had ordered the country’s army to continue fighting with all its forces in Lebanon.

Through Thursday, the Israeli military said it struck Hezbollah targets in Lebanon’s south and in the Bekaa Valley in the country’s east. It said the attacks included infrastr