The top leader of Hamas dared Israel on Monday to launch a ground invasion of Gaza and dismissed diplomatic efforts to broker a cease-fire in the six-day-old conflict, as the Israeli military countered Gazan rockets with a new wave of deadly airstrikes on the Palestinian enclave. The Israeli strikes included a second hit on a 15-story Gaza City building that houses media outlets, in which a top militant leader was killed. Among the volley of rockets fired from Gaza into southern Israel on Monday was one that hit a vacant school.
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