What is the name of movie?

What is the name of movie in which a group of people went for water rafting in a jungle. While they were resting, a group of man eaters attacked them and they killed all of them one by one by their cruel plotting. They kill their victim cruelly by tying them with wires. A group of rescuers came to save them but they also fell into their ill fate. In the a girl and a rescuer manage to save their life from those infecting man eaters. And film ends with hinting that still there are few man eaters are left.