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By Nidal al-Mughrabi and Maayan Lubell GAZA/JERUSALEM (Reuters) - Israeli aircraft bombed the Gaza Strip on Saturday and Palestinian militants fired rockets at the Jewish state, the military said, with no end in sight to the deadliest violence between the sides in years. Gaza health officials said five people were killed in an Israeli strike on a house in central Gaza. The Israeli military said it bombed about 20 targets across the Hamas-dominated strip, including rocket launchers and weapon caches. Israeli Prime Minister Benjamin Netanyahu on Friday threatened to escalate the fight against Hamas, vowing the militant group would "pay a heavy price" after a four-year-old Israeli boy was killed by a mortar attack from Gaza.