An oil spill in northwestern Ecuador has turned a river black, prompting authorities to declare an environmental emergency amid "unprecedented" damage and to order residents to ration drinking water, officials said. The spill, believed caused when a landslide ruptured a major oil pipeline, has turned waters black in a section of the Esmeraldas River, in the province of the same name. The Emergency Operations Committee in the provincial capital, also called Esmeraldas, declared the environmental emergency. IMAGES