The death toll in the Gaza Strip rose to 31 Palestinians, including six children, on Sunday afternoon following two days of brutal Israeli attacks.
The Palestinian health ministry said that 253 people in Gaza had been wounded since the hostilities with Israel broke out on Friday.
The violence is the worst in Gaza since a war last year that devastated the impoverished territory.
Israel said it launched the attacks in what it described as the pre-emption of an attack by Palestinian Islamic Jihad attack meant to avenge the arrest of a group leader in the occupied West Bank.
About 2.3 million Palestinians are packed into the narrow coastal Gaza Strip, with Israel and Egypt tightly restricting the movement of people and goods in and out of the enclave.