Palestinian officials say at least 45 Gazans have been killed and more than 390 wounded since Israel launched its aerial campaign on Wednesday.
On Saturday, 15 Palestinians were killed and the Hamas government headquarters was destroyed, as Israel intensified its assault on Gaza.
As the toll rises and sirens sounded in Tel Aviv for a fourth day, Israel says it has deployed more tanks to the border and called up thousands more reservists as fears of a ground offensive increase.
Meanwhile, an emergency session of the Arab League has ended with calls for a fresh approach to end the crisis between the Palestinians and Israelis.
Al Jazeera's Jacky Rowland reports from Gaza, where ordinary civilians are paying the price for this latest round of fighting.