Hilary Clinton in crisis talks with Israeli Prime Minister

The United States signaled today that a Gaza truce could take days to achieve
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Israel's Prime Minister Benjamin Netanyahu (R) walks with U.S. Secretary of State Hillary Clinton upon her arrival to their meeting November 20, 2012 in Jerusalem, Israel. The United States signaled today that a Gaza truce could take days to achieve after Hamas, the Palestinian enclave's ruling Islamist militants, backed away from an assurance that it and Israel would stop exchanging fire within hours. (Getty Images)
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In this handout provided by U.S. Embassy Tel Aviv, U.S. Secretary of State Hillary Clinton (C) arrives November 20, 2012 in Tel Aviv, Israel. Efforts by Western and Arab diplomats to end the confrontation between Israel and Gaza have escalated. (Getty Images)
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Israel's Prime Minister Benjamin Netanyahu delivers joint statements with U.S. Secretary of State Hillary Clinton (not seen) November 20, 2012 in Jerusalem, Israel. The United States signaled today that a Gaza truce could take days to achieve after Hamas, the Palestinian enclave's ruling Islamist militants, backed away from an assurance that it and Israel would stop exchanging fire within hours. (Getty Images)
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U.S. Secretary of State Hillary Clinton and Israel's Prime Minister Benjamin Netanyahu (not seen) deliver joint statements November 20, 2012 in Jerusalem, Israel. The United States signaled today that a Gaza truce could take days to achieve after Hamas, the Palestinian enclave's ruling Islamist militants, backed away from an assurance that it and Israel would stop exchanging fire within hours. (Getty Images)
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In this handout image supplied by the Israeli Government Press Office (GPO), Israeli Prime Minister Benjamin Netanyahu (R) meets U.S. Secretary of State Hillary Clinton at the prime minister's office November 20, 2012 in Jerusalem, Israel. Clinton arrived in Israel as efforts by Western and Arab diplomats to end the confrontation between Israel and Gaza have escalated. (Getty Images)
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Israel's Prime Minister Benjamin Netanyahu (R) and U.S. Secretary of State Hillary Clinton deliver joint statements November 20, 2012 in Jerusalem, Israel. The United States signaled today that a Gaza truce could take days to achieve after Hamas, the Palestinian enclave's ruling Islamist militants, backed away from an assurance that it and Israel would stop exchanging fire within hours. (Getty Images)
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Fire rises during an explosion following an Israeli strike on the border tunnels between Egypt and Rafah in the southern Gaza Strip on November 20, 2012. US Secretary of State Hillary Clinton vowed to support Israeli security on November 20 while calling for a quick de-escalation of Gaza fighting that stretched on unabated amid signs of an emerging truce deal. (AFP/Getty Images)
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Fire rises during an explosion following an Israeli strike on the border tunnels between Egypt and Rafah in the southern Gaza Strip on November 20, 2012. US Secretary of State Hillary Clinton vowed to support Israeli security on November 20 while calling for a quick de-escalation of Gaza fighting that stretched on unabated amid signs of an emerging truce deal. (AFP/Getty Images)