The following article by Conn Hallinan is from Alternet:
August 5, 2010 | If you want to understand what’s behind the recent tension between Colombia and Venezuela, think “smokescreen,” and then go back several months to some sick children in the Department of Meta, just south of Bogota. The children fell ill after drinking from a local stream, a stream contaminated by the bodies of more than 2,000 people, secretly buried by the Colombian military.