Hours before a cease-fire proposal was ratcheted together by Egypt and France, Israel launched its single deadliest attack in Gaza. The mortar fire hit a school run by the United Nations. At least 30 Palestinians, who were seeking refuge in the school, were killed. Israel claims the targeting was in response to rocket fire from within the school. Needless to say, the U.N. is ticked off. Joining us with details is the New York Times' Isabel Kershner on her way to Gaza.

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