Nisreen Nassar and her family, like many other Palestinians, continue to live in schools and makeshift shelters.

Hamas called Saturday's strikes "a renewed flagrant violation" and urged the United States and other mediating countries to push Israel to stop the strikes.

Muslim Palestinians in Gaza are preparing for the Islamic holy month of Ramadan under a fragile ceasefire deal.

Israeli strikes on Gaza have killed about 600 people since a cease-fire began, according to health officials in the territory. Many displaced Palestinians are still living in tents. And there are some 60 million tons of war debris to be cleared.

Gaza medical officials say Israeli strikes killed at least 19 people, including two infants, with one hospital director asking, "Where is the ceasefire?"

Little Ramadan lanterns and string lights appeared on streets lined with collapsed buildings and piles of rubble in Gaza City, bringing joy and respite as Islam's holiest month began -- the first since October's ceasefire.

Palestinians hold first Ramadan prayers at school-turned shelter in Gaza City