Four Americans and their Costa Rican tour guide were killed on Saturday when their rafts overturned on the Naranjo River in Quepos, Costa Rica. Officials on Sunday said three rafts carrying 18 people overturned, and 13 passengers were able to hang onto the rafts, but five were pulled downstream. The victims have been identified as American tourists Ernesto Sierra, Jorge Caso, Sergio Lorenzo, and Andres Dennis, all between the ages of 25 and 35, and their Costa Rican tour guide, Kevin Thompson Reid. The river was high from rains, officials said, and the Red Cross had 12 workers in the area, who helped assist with the rescue.