Several children in the Nevada and Arizona have developed strange cases of leukemia, and officials are trying to determine what the cause may be. So far, the search is centering on environmental factors.

Researchers from around the area are looking at genetic changes that happened during infancy (or before birth) as well as anything that may have changed before the mysterious onset of leukemia in this odd cluster in the desert.

Since 1997, 17 children have fallen ill from leukemia while three have died, and the water and environmental factor correlation still have produced no results, but progress is being made, according to the researchers. One thing that has been discovered -- a high amount of Tungsten has been discovered in the area where the leukemia cluster is contained.