Tens of thousands of exhausted Palestinians were returning to their ruined homes on Saturday, a day after a ceasefire between Israel and the militant Hamas group took effect in Gaza .  Reuters news agency described a huge column of people traveling on foot north along the coastal road overlooking sandy beaches towards Gaza City, the enclave's largest urban area. Until Friday afternoon, the city was the target of one of Israel's biggest offensives of the war. Gaza civil defense spokesman Mahmud