SAN JOSE, Oct. 21 (Xinhua) -- Costa Rica on Sunday released the names of four U.S. tourists and their local guide, who were killed in a rafting accident over the weekend, local media reported.

The tourists, all men aged 25 to 35, and their 45-year-old guide died when their rafts turned over on Saturday afternoon as they navigated the Naranjo River in the south central coastal town of Quepos, the daily La Nacion said.

The river had been swollen by recent rains and all three rafts that were part of the excursion flipped. Another 10 tourists and four guides reportedly survived.

The foreigners were in Costa Rica "to celebrate the bachelor party of one of the survivors," La Nacion said.

Via Twitter, Costa Rican President Carlos Alvarado expressed his "profound consternation at the accident."

Alvarado also thanked the rescue teams and said he instructed authorities to offer their support to the relatives of the victims.

The victims were identified as guide Kevin Thompson Reid and tourists Ernesto Sierra, Jorge Caso, Sergio Lorenzo and Andres Denis, reported La Nacion, citing the Judicial Investigation Organization.