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Israeli soldiers gesture as they travel atop a tank outside the Gaza Strip July 18, 2014. Israel stepped up its land offensive in Gaza with artillery, tanks and gunboats on Friday and declared it could "significantly widen" an operation Palestinian officials said was killing ever greater numbers of civilians. Israeli gunboats lit up the sky with their fire before dawn while helicopters fired into the coastal enclave. Hamas fired mortar rounds at the invading troops and rockets across the border at the southern Israeli towns of Ashdod and Ashkelon. REUTERS/Ronen Zvulun
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Israeli reservist soldiers check their gear as they stand atop armoured personnel carriers (APCs) in a staging area outside the Gaza Strip July 18, 2014. Israel stepped up its land offensive in Gaza with artillery, tanks and gunboats on Friday and declared it could "significantly widen" an operation Palestinian officials said was killing ever greater numbers of civilians. Israeli gunboats lit up the sky with their fire before dawn while helicopters fired into the coastal enclave. Hamas fired mortar rounds at the invading troops and rockets across the border at the southern Israeli towns of Ashdod and Ashkelon. REUTERS/Nir Elias
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Israeli soldiers travel in armoured personnel carriers (APCs) outside the Gaza Strip July 18, 2014. REUTERS/Ronen Zvulun
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An Israeli tank moves into position near Israel and Gaza border, Friday, July, 18, 2014. Israeli troops pushed deeper into Gaza on Friday to destroy rocket launching sites and tunnels, firing volleys of tank shells and clashing with Palestinian fighters in a high-stakes ground offensive meant to weaken the enclave's Hamas rulers. Israel launched the operation late Thursday, following a 10-day campaign of more than 2,000 air strikes against Gaza that had failed to halt relentless Hamas rocket fire on Israeli cities. .(AP Photo/Dusan Vranic)
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Israeli soldiers display their national flag from the top of an armoured personnel carrier as they deploy near Israel's border with the Gaza Strip on July 18, 2014 (AFP Photo/Jack Guez)
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An Israeli tank advances near the Israel-Gaza Strip border on Friday as part of Israel's ground incursion in the territory. Israel launched the ground operation Thursday following more than a week of airstrikes that did not halt Palestinian rocket fire. Dusan Vranic AP
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Israeli tanks are on the move near Israel and Gaza border, Friday, July 18, 2014. (AP Photo/Dusan Vranic)