The deadly exchange of fire between Palestinian militants in the Gaza Strip and the Israeli military has escalated significantly, with the UN fearing a "full-scale war".
More than 1,000 rockets have been fired by Palestinian militants, Israel says.
Israel has carried out hundreds of air strikes on Gaza, destroying three tower blocks and killing senior Hamas officials.
Since Monday at least 65 Palestinians and six people in Israel have died. That includes 16 Palestinian children caught up in the conflict.
Ros Atkins looks at the reasons why the tensions, which reach back decades, have heightened now.
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