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By Nidal al-Mughrabi and Maayan Lubell GAZA/JERUSALEM (Reuters) - Israel rushed an eighth missile interceptor battery into service on Saturday to counter stronger-than-expected rocket fire from Gaza as the military pounded positions in the Palestinian enclave for a fifth day, killing 19 people, medics said. The Jewish state kept options open for a possible ground offensive into densely populated Gaza despite international pressure to negotiate a ceasefire in the conflict, which has killed 125 people in the Islamist-ruled enclave since Tuesday. A mosque in the central Gaza Strip had been bombed to rubble, residents said. The Israeli military said the mosque had housed a weapons cache.