At first, researchers suspected chemical spill or some pollutant was responsible.

It was initially believed there may have been a chemical spill at the scene but that was ruled out.

Rumors began to surface that the government was trying to conceal a chemical spill.

The incident did not have available data on the chemical spill including data on repeated dose toxicity, carcinogenicity, reproductive toxicity, specific target organ toxicity, and repeated exposure.

Of course, failure of the well casing or surface chemical spills can happen occasionally, as in any industry.