Israel's war to stop Hamas's rockets continued overnight with 100 strikes from the air and sea, according to a count in Gaza. Meanwhile, Hamas retaliated with more than 20 new launches toward southern Israel and Tel Aviv. NBC's Richard Engel reports.By NBC News and wire reportsUpdated at 8:19 a.m. ET: GAZA CITY, Gaza Strip -- International mediation efforts gathered steam Monday as Israel bombed dozens of suspected guerrilla sites in the densely populated Hamas-ruled Gaza Strip in its campaign to quell militant rocket fire menacing nearly half of Israel's population.
Overnight, an airstrike leveled two houses belonging to a single family, killing two children and two adults and injuring 42 people, Gaza heath official Ashraf al-Kidra said. Rescue workers frantically searched for 12 to 15 people under the rubble.
Shortly after, Israeli aircraft bombarded the remains of the former national security compound in Gaza City. Al-Kidra said flying shrapnel killed one child and wounded others living nearby.
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