Lt Col Peter Lerner from the Israeli army said they were currently reviewing what happened in this morning's "tragic" incident, when at least 15 Palestinian refugees were targeted as they slept in UN school shelter.
Speaking to ITV News Presenter Mark Austin he said what he did know at this stage is that mortar was fired at the army from near the school, and soldiers returned fire.
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.