Amid growing protests against the controversial Hidroituango dam on Colombia's Río Cauca, three opponents of the project were slain by unknown assailants—weeks before a tunnel in the complex collapsed due to a landslide, backing up water behind the dam to dangerous levels and causing cracks to emerge in its facade. Authorities now fear an imminent disaster, posing a grave threat to downstream communities. Several opponents of the project have been assassinated over the years of its construction, leading to demands for an investigation of possible paramilitary collusion by the dam's builders. (Photo via El Espectador)