At least seven people have died and 30 others were injured when a air strike hit a UN-run school in the southern Gaza Strip, Reuters reported, citing witnesses and medics.
The Israeli military declined to immediately comment.
Hundreds of Palestinians in the area were reported to have been sheltering in 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.