A Palestinian man reacts at the burnt classroom of the UN-run school that was hit earlier today by an Israeli strike in Beit Lahia, northern Gaza Strip on January 17, 2009. United Nations officials today demanded an investigation into a new Israeli strike on a UN-run school in Gaza, which killed a woman and a child in the fourth such attack during its war on Hamas. AFP PHOTO / MAHMUD HAMS (Photo credit should read MAHMUD HAMS/AFP/Getty Images)