Troy Krastev weeps at the site of the World Trade Center attack as a shadow of a nearby building is cast on part of the World Financial Center on the fourth anniversary of the attack in New York September 11, 2005. Krastev's friend lost a brother in the attack. REUTERS/Rick Wilking
Family members place flowers in a pool of water located in the footprint of the north tower of the former World Trade Center during ceremonies marking the fourth anniversary of the attack of the twin towers in New York September 11, 2005. Families of victims of the collapse of the World Trade Center were allowed down to two pools of water placed on the ground where the buildings once stood. REUTERS/Gary Hershorn