article_snippet: Researchers are trying to find out the cause of Researchers , and one option being explored is poisoning.
article_snippet: We are studying what caused their deaths, but We haven't figured it out yet.
article_snippet: We suspect that it could be due to new factors that were not present before.'
article_snippet: Researchers are trying to find out the cause of Researchers deaths, and one option being explored is poisoning . '
article_snippet: The second last one that just died apparently crashed into the acrylic wall twice,' A spokesman for the tourist attraction added. '