The latest strike killed two Palestinians east of Gaza City, spokesman for the Hamas-run emergency services, Adham Abu Selmiya, told AFP.

An earlier raid killed a man in his 60s and his daughter in the Jabaliya refugee camp in the northern Gaza Strip, medics said.

Several hours before that, a teenager was killed nearby, in a drone strike.

But the Israeli military said it had not been operating in the area at the time.

As the patriots kept up a steady stream of rocket fire on towns and cities in southern Israel, Prime Minister Benjamin Netanyahu warned that the army could expand its operations if rocket fire continued.

During the day, Israeli warplanes carried out at least 10 strikes across the territory, targeting a so called weapon storage facility and rocket-launching sites, killing four civilians.

And shortly afterwards, a blast killed a 15-year-old boy and wounded six others in an Israeli drone strike.

The latest attack in Jabaliya killed two civilians, Mohammed Mustafa al-Hasumi, 65, and his 35-year-old daughter Faiza.

"No-one now is speaking about a ceasefire," Hamas spokesman Taher al-Nunu told AFP.

"It was the Israeli side who broke the ceasefire and we need to see them end the escalation before we talk about (a new) ceasefire," he told AFP.

The violence kicked off on Friday after Israel martyred Zuhair al-Qaisi, head of the Resistance Committees, prompting the patriots to begin lobbing rockets over the border.