Rescuers say at least 23 people have been killed after Israel hit the Gaza Strip on Sunday.
The latest deaths come after Israel said late on Saturday for a truce and hostage release deal.
An airstrike on a house in northern Gaza's Sheikh Radwan area killed at least 11 people early on Sunday, according to civil defence agency spokesman Mahmud Bassal.
He said the victims included women and children.
"Rescuers are still searching for five people trapped under the rubble of the house," he said, adding his crew members were using "bare hands" in the effort.
The Israeli military said on Sunday it had struck more than 100 "terror targets" in Gaza over the past two days, marking an apparent escalation in its assault.
The Gaza health ministry said a total of 88 people were killed over the past 24 hours.
In one strike, five people died when the house of the Abu Jarbou family was struck in the Nuseirat refugee camp in central Gaza, rescuers said.
Several of the strikes targeted sites from which militants had been firing projectiles into Israel in recent days, the military said.
Last week, Israeli defence minister Israel Katz warned of intensified strikes if the incoming rocket fire continued.
Qatar, Egypt and the US push for ceasefire talks
Both warring sides said indirect negotiations for a ceasefire and hostage release deal were to resume in Qatar.
Mediators Qatar, Egypt and the United States have tried for months to strike a deal to end the war. The latest effort comes just days before Donald Trump takes office as US president on 20 January.
"Efforts are underway to free the hostages," Katz told relatives of a hostage on Saturday, according to his office.
French foreign minister Jean-Noël Barrot, in an interview with RTL radio, said that "we continue to exert the necessary pressure" to reach a deal.
"Unfortunately, it doesn't depend only on us."
