UMM NASER, Gaza Strip -- A huge sewage reservoir in the northern Gaza Strip collapsed Tuesday, killing five people in a frothing cascade of waste and mud that swamped a village and highlighted the desperate need to upgrade Gaza's overburdened infrastructure. Rescue crews and Hamas gunmen rushed to the area to search for people feared buried under the sewage and mud. Dressed in wetsuits, they paddled boats through the layer of foam floating on the green and brown rivers of waste. Others waded up to their hips into the sewage. The noxious smell of waste and dead animals hung in...