Colombian tribe calls for action on alleged effects of UK oil firm

In part two of our series, indigenous Siona people claim their health is being affected by apparent contamination of river

Maria Isaura Cuaran, an indigenous Siona woman, is displaying a rash that has appeared at the base of her neck. It is barely visible, but there nonetheless. Pulling her turquoise top off her left shoulder and tugging down on her bead necklace, Cuaran talks about "the company" and how, she alleges, it has affected the local river.

"Stomach problems, coughing, fever, vomiting, diarrhoea, welts, little spots, little blotches, general malaise ""