LAS VEGAS (AP) — A week after a decades-old body was found in receding Lake Mead, authorities in Las Vegas are trying to identify a second set of newly discovered human remains. Two sisters from the Las Vegas suburb of Henderson were paddle boarding on the drought-stricken Colorado River reservoir when they spotted bones Saturday in the Callville Bay area of the lake. Lindsey Melvin told KLAS-TV that they thought at first it was a bighorn sheep, but saw what appeared to be a human jaw and called park rangers.