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 now been fired by Palestinian militants, Israel says.
Israel has carried out hundreds of air strikes, destroying two tower blocks in Gaza on Tuesday and Wednesday.
At least 53 Palestinians and six Israelis have been killed since Monday.
That includes 14 Palestinian children caught up in the conflict.
UN Secretary-General António Guterres said he was "gravely concerned" by the ongoing violence.
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L'informazione della testata giornalistica di LA7 diretta da Enrico Mentana