Four American tourists and a local guide were killed in a rafting incident in Costa Rica on Saturday, authorities said. Fourteen tourists and five guides were thrown into the waters of the Naranjo River in Costa Rica at around 3 p.m. local time on Saturday. The five victims were carried away by the current, while others managed to cling to the rafts and were rescued by another guide in a kayak. The four Americans, named as Ernesto Sierra, Jorge Caso, Sergio Lorenzo and Andres Denis, had traveled to Costa Rica from Miami, Florida, for a bachelor party.