Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Botswana Hopes Mysterious Elephant Deaths Are Over; Zimbabwe Records Its First Mqondisi Dube GABORONE - Botswana says a string of mysterious elephant'¯deaths has come to a halt since June, after at least 281 carcasses were found. Experts in the southern African country, with the world's largest elephant population, said there were no signs of poaching or predators. Most of the blood samples sent abroad for testing indicate a toxin caused the deaths. However, it is not clear if the toxin is man-made or natural, says Botswana's Ministry of Wildlife and Environment Permanent Secretary Oduetse Koboto. "We have received most of the results. A lot of variables that we suspected had tested negative. We ruled out any virus, no bacteria. Pathogens (are) also negative," he said. "The only thing that we are waiting for is toxicology. What is evident is that we are now dealing with a poison."'¯'¯'¯'¯'¯'¯ Koboto says they are waiting on one last batch of test results from the United States before reaching a conclusion. .