Summary At least seven members of the same family, including four children, were among nine people killed.
Israeli missile struck a family home in Gaza City, the health ministry said Sunday.
Among the dead were a man, two women and four children, all of whom were from the al-Dallu family, said spokesman Ashraf al-Qudra.
A 70-year-old woman, also believed to be from the same family, and a 22-year-old man were also killed, he said.
At least 20 people were injured in the strike, which flattened the three-storey building in Gaza City s Nasser neighbourhood.
The statement said two women and a man had been killed and 10 wounded in a strike which hit a house in the city s northern Nasser district, raising the overall toll to 56 Palestinians killed in nearly 100 hours of relentless raids.
Israel bombed Palestinian militant targets in the Gaza Strip from air and sea for a fifth straight day on Sunday, preparing for a possible ground invasion while also spelling out its conditions for a truce.
Palestinians launched dozens of rockets into Israel and targeted its commercial capital, Tel Aviv, for a fourth day. The "Iron Dome" missile shield shot down two of the rockets fired toward Israel s biggest city but falling debris from the interception hit a car, which caught fire. Its driver was not hurt.
Prime Minister Benjamin Netanyahu said Israel was ready to widen its offensive.
"We are exacting a heavy price from Hamas and the terrorist organisations and the Israel Defence Forces are prepared for a significant expansion of the operation," Netanyahu said at a cabinet meeting, giving no further details.
In air raids on Sunday, two Gaza City media buildings were hit, witnesses said. Eight journalists were wounded and facilities belonging to Hamas s Al-Aqsa TV as well as Britain s Sky News were damaged.
An employee of Beirut-based al Quds television station lost his leg in the attack, local medics said.
The Israeli military said the strike targeted a rooftop "transmission antenna used by Hamas to carry out terror activity", and that journalists in the building had effectively been used as human shields by the group.
Three other attacks killed three children and wounded 14 other people, medical officials said, with heavy detonations regularly jolting the Mediterranean coastal enclave.
