Hundreds of Palestinian civilians fled south in Gaza on Tuesday by foot or on donkey carts. In the north of the Gaza Strip, Israeli ground forces backed by relentless airstrikes have encircled Gaza City since the weekend. The army has been urging civilians to move south, but tens of thousands of civilians have remained in the north, many sheltering in hospitals or UN facilities as the south, too, was barraged by airstrikes and some people killed as they travelled