 Live from NPR News, I'm Dale Willman. An Israeli airstrike Saturday hit a UN school where displaced people were sheltering in Gaza. At least 16 people were killed and another 50 wounded, according to the Gaza Ministry of Health. NPR's Kat Lansdorf has more and a warning. This report contains some disturbing details. The school is in Nuserat in central Gaza, where many fled after recent evacuation orders. NPR's producer in Gaza, Anas Baba, went to the school shortly after the strike. It was filled with families and children.