A trail of blood is seen in the courtyard of a UN School in the northern Beit Hanun district of the Gaza Strip on July 24, 2014, after it was hit by an Israeli tank shell. At least nine people were killed, including a baby, when an Israeli tank shell slammed into a UN-run school in the northern Gaza Strip, an AFP correspondent said. AFP PHOTO/MARCO LONGARI        (Photo credit should read MARCO LONGARI/AFP/Getty Images)