Summary Israeli strikes on Gaza killed 10 Palestinians and destroyed the Hamas headquarters on Saturday.
After Palestinian militants fired rockets at the heart of Israel on Friday, Israeli warplanes carried out 180 air strikes overnight, Israel television reported, with attacks levelling the headquarters of the Hamas government.
"It s like a real-life horror movie, what I saw today... It s a miracle we re still alive," said 18-year-old Suha, standing outside her house.
Medics said 40 Gazans have been killed and more than 390 wounded since Israel launched its aerial campaign on Wednesday afternoon, with at least five militants among 10 people killed on Saturday.
As the toll rose, sirens sounds in Tel Aviv for a third day, sending people scuttling for cover a day after a rocket hit the sea near the city centre, AFP correspondents said.
Officials said one rocket was intercepted by the Iron Dome anti-missile system while a second hit somewhere in the Tel Aviv metropolitan area.
In Egypt, Turkish Prime Minister Recep Tayyip Erdogan said Israel would be held to account for the children killed.
"Everyone must know that sooner or later there will be a holding to account for the massacre of these innocent children killed inhumanely in Gaza," he said in a speech in Cairo.
So far, six children have died in the violence, the Palestinian Centre for Human Rights said.
Arab League foreign ministers attending an emergency session in Cairo were expected to demand that Israel immediately halt its campaign, an Arab diplomat told AFP.
Hamas chief Khaled Meshaal was also in Cairo and scheduled to meet Egypt s intelligence chief, Erdogan and Qatari emir Sheikh Hamad bin Khalifa al-Thani, a senior Hamas official said.
With Cairo playing a central role in efforts to halt the violence, Italian Prime Minister Mario Monti appealed for a truce in a telephone conversation with his Israeli counterpart Benjamin Netanyahu, Monti s office said.
Since the start of Operation Pillar of Defence, the Israeli army says militants have fired more than 600 rockets over the border, of which 430 hit and 245 were intercepted by the Iron Dome defence system.
Over the same period, three Israelis have been killed and 18 injured, including 10 soldiers, with the army saying the air force had hit more than 950 targets in Gaza.
