Israeli tanks and gunboats pummeled around 100 targets in Gaza overnight as around 50,000 of soldiers inched into the Palestinian enclave -- which is home to 1.7 million people -- battling Hamas fighters as they went. One Israeli soldier was killed in fighting, and four were wounded, Israel said. Hamas responded with a barrage of rockets into southern Israel. Some 18,000 Israeli reservists were also called up late Thursday.
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