Israel will investigate the shelling of a UN school in Gaza to decide whether Israeli fire was responsible for an attack which killed at least 16 people.
Israeli government spokesman Mark Regev told BBC's Newsnight programme: "We will investigate that. And if we find that it was errant fire from Israel I'm sure we will apologise.
"It's not clear to us that it was our fire but we know for a fact there was hostile fire on our people from the vicinity of the school."
There have been two days of quiet in Gaza. No rockets or missiles, no more destroyed houses, no more ambulance sirens screaming.
A three-year-old girl has been rescued from Gaza and brought to London for life-saving heart surgery.
A small team of NHS doctors and surgeons is travel to Gaza to set up facilities and establish how best to use specialists and equipment.