Tragedy struck over the weekend when a rafting trip went really bad.

A group of 14 tourists along with four guides on rafts and one in a kayak were on the trip on the Naranjo River on Saturday when the incident took place.

Three rafts flipped at around 3pm. The accident may’ve been caused since “the river was swollen by rain, and the National Emergency Commission maintained an alert in the area because of the possibility of flooding,” according to NBC News.

While the other guides and tourists were able to hold onto rafts, the victims, four Americans and one local guide were pulled downstream. The victims were identified as Ernesto Sierra, Jorge Caso, Sergio Lorenzo and Andres Dennis, ranging in age from 25 to 35 years old. The guide was Kevin Thompson Reid.

All of the Americans were from Florida, visiting Costa Rica for a bachelor party. While the groom survived, one of the victims was his brother.

The group had arrived in Costa Rica on Thursday and were renting out a house in Playa Hermosa de Jaco.

Find out more from NBC News here.