Israeli tanks advanced in Tel Al-Sultan and shells landed in the coastal area, where thousands of Palestinians, many of them displaced several times already, have sought refuge.
Despite growing international pressure for a ceasefire, an agreement to halt the fighting still appears distant, more than eight months since the start of the war in October.
In Israeli air strikes on two houses in Gaza City suburbs, residents said at least 15 people were killed.
Four others were killed in separate attacks in the south, medics said.
It said militants had on Friday fired five rockets from the humanitarian area in central Gaza.
Israeli tanks advanced in Tel Al-Sultan and shells landed in the coastal area, where thousands of Palestinians, many of them displaced several times already, have sought refuge.
Despite growing international pressure for a ceasefire, an agreement to halt the fighting still appears distant, more than eight months since the start of the war in October.
In Israeli air strikes on two houses in Gaza City suburbs, residents said at least 15 people were killed. Four others were killed in separate attacks in the south, medics said.
The Israeli military on Saturday said its forces in Rafah, the southernmost city in Gaza, close to the border with Egypt, had captured large quantities of weapons, both above ground and concealed in the extensive tunnel network built by Hamas.
It said militants had on Friday fired five rockets from the humanitarian area in central Gaza. It said two had fallen in open areas in Israel and three fell short in Gaza.
"This is a further example of the cynical exploitation of humanitarian infrastructure and the civilian population as human shields by terror organizations in the Gaza Strip for their terrorist attacks," the military said.
