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Israeli flares lit up the night sky in the northern Gaza Strip early Saturday. Israeli troops have pushed deeper into Gaza 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. Israeli airstrikes killed 12 people in Gaza overnight, raising the overall death toll of Palestinians during the 10-day offensive to 310, Palestinian officials said on Saturday.

An Israeli army flare illuminates the sky above the Gaza Strip late on July 18.JACK GUEZ / AFP - Getty Images