Israel bombs Gaza school, 20 killed

A displaced Palestinian child stands in a classroom, at the Abu Hussein UN school in Jebaliya refugee camp. Israeli tank shells tore through the walls of the UN school crowded with war refugees on Wednesday in the deadliest of a series of air and artillery attacks that pushed the Palestinian death toll above 1,300 in more than three weeks of fighting. (Source: AP)

The attack on the UN school in the Jebaliya refugee camp that killed at least 20 people and wounded 90 more, was the second deadly strike on a UN compound in a week. In this photo, a Palestinian girl carries belongings as she and her family leave the Abu Hussein UN school in the Jebaliya refugee camp in northern Gaza Strip. (Source: AP)

Tank shells slammed into the compound before dawn, said a spokesman for the UN Relief and Works Agency, which is sheltering more than 200,000 people displaced by the fighting at dozens of U.N. schools across Gaza. In this photo, a displaced Palestinian removes tiles from a damaged wall of a classroom, at the Abu Hussein UN school which was hit by an Israeli strike. (Source: AP)

Palestinians collect body parts in a classroom at Abu Hussein U.N. school in Jebaliya refugee camp, northern Gaza Strip. (Source: AP)

A UN worker cleans the garbage at the courtyard of the Abu Hussein UN school, in Jebaliya refugee camp, northern Gaza Strip. (Source: AP)

A displaced Palestinian girl pauses at the Abu Hussein UN school, hit by an Israeli strike earlier, in Jebaliya refugee camp, northern Gaza Strip. (Source: AP)

UN workers remove a wounded donkey, injured by an Israeli strike earlier, along with killed ones at the Abu Hussein UN school. (Source: AP)

A displaced Palestinian boy, still inside a classroom, eats a snack at the Abu Hussein UN school in Jebaliya refugee camp. (Source: AP)

With displaced Palestinians still inside, a youth walks by the debris in a classroom at the Abu Hussein UN school in Jebaliya refugee camp. (Source: AP)