At least 15 Palestinians were killed in new Israeli strikes on Gaza City late on Saturday, medics in the coastal enclave said.
"At least 15 Palestinians were killed in an Israeli strike on the Tuffah neighbourhood in Gaza City that hit a house and a mosque," emergency services spokesman Ashraf al-Qudra said.
An earlier toll said 10 were killed.
Signup to our newsletter and follow us on Facebook and Twitter!
Another 35 were wounded in the same strike, and one more person was killed in southern Gaza's Rafah that also injured five people, Qudra said.
The strikes came after Hamas launched a barrage of long-range rockets at Israeli cities including Tel Aviv, after issuing a warning that it would strike.
The new deaths brought the toll in the fifth day of the conflict to 151, with more than 1,000 people wounded.
On Friday, the United Nations' Office for the Coordination of Humanitarian Affairs said a majority of those killed in Gaza so far -- 77 percent -- were civilians.