Qatar-based news channel Al Jazeera said its cameraman Ahmed al-Louh was killed "in an Israeli bombardment" that targeted Nuseirat refugee camp in the central Gaza Strip.
Civil defence spokesman Mahmud Bassal confirmed Louh was killed in the strike that "targeted the Civil Defence site" in Nuseirat camp, also killing three members of the rescue agency.
Louh is the fifth Al Jazeera journalist to be killed since the war in Gaza began, and the network's office in the territory has been bombed.
Later on Sunday, Bassal told AFP that an Israeli strike on a school used as shelter by displaced Palestinians in southern Gaza's main city killed at least 12 people, including a number of children.
"One missile hit the third floor of the school" in Khan Yunis, also injuring 35 people, Bassal said.
Contacted by AFP, the Israeli military said it was looking into the report.
Another strike on a house in Shujaiya, east of Gaza City, killed six people, according to the civil defence spokesman.
Bassal earlier told AFP that rescuers working through the night recovered the bodies of 18 people, including three children.
He also reported more dead in a strike on a house in central Gaza City and another that his a tent sheltering dozens of displaced people in Deir el-Balah in central Gaza.
AFP images showed distraught relatives mourning the bodies of loved ones at a hospital in Gaza City. Some corpses lay on the floor covered in blankets.
On Sunday, the military confirmed it had carried out strikes in the northern Beit Hanoun and Beit Lahia areas.
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