Israel says it will investigate the shelling of a school housing displaced civilians in Gaza, and apologise if Israeli fire was responsible.
A government spokesman told the BBC: “We have a policy — we don’t target civilians”.
The US and UN condemned the attack, which killed at least 16. Israel said its military responded to mortar rounds launched from near the school.
More than 100 Palestinians were killed on Wednesday, Gaza officials said.
The shelling of a market near Gaza City killed 17, while booby traps claimed the lives of three Israeli soldiers.
At least 1,360 Palestinians have been killed since the current conflict began on 8 July. Most have been civilians.
Some 58 Israelis have been killed, 56 soldiers and two civilians. A Thai worker in Israel has also died, BBC informs.
