By Mohammed Salem, Nidal al-Mughrabi and Anthony Deutsch GAZA/THE HAGUE (Reuters) -Israel faced accusations at the World Court on Thursday of genocide in its war in Gaza, as the first residents returned to northern areas where Israeli forces have begun withdrawing, leaving behind scenes of total devastation. Three months of Israeli bombardment has laid much of the narrow coastal enclave to waste, killing more than 23,000 people and driving nearly the entire population of 2.3 million Palestinians from their homes. An Israeli blockade has sharply restricted supplies of food, fuel and medicine, c…