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By Nidal al-Mughrabi and Ori Lewis GAZA/JERUSALEM (Reuters) - Israel pressed on for a fourth day with its Gaza offensive on Friday, striking the Hamas-dominated enclave from air and sea, as Palestinian militants kept up rocket attacks deep into the Jewish state. At least 79 Palestinians, most of them civilians, have been killed in the offensive, which Israel says it launched to end persistent rocket attacks on its civilian population, some of which have reached Tel Aviv, Jerusalem and other cities. The salvoes into Israel have caused no fatalities or serious injuries, due in part to interception by Israel's partly-U.S. funded Iron Dome aerial defense system. One rocket on Friday hit a petrol station in Israel's port city of Ashdod, causing a huge blaze and at least three people were seriously wounded, an ambulance spokesman said.