The Kansas Fire Marshall’s Office on Thursday issued a preliminary report into the explosion at a grain elevator that killed four employees and two state inspectors.   According to preliminary evidence, the explosion was an accident, and no criminal activity is suspected.

Experts examined directional patterns of the explosion and fire to lead them to the origin in the bin area.  Authorities say some areas are still not accessible, and some fire still smolders in the bin areas.

The Bartlett Grain Co. elevator is located south of Atchison.  Two employees were critically burned in the incident October 29.  On Wednesday, a public memorial was held for the victims.

Preliminary results show the cause was accidental, though more investigation is needed to confirm those results. Officials say there is no evidence to indicate criminal activity.

It will take several weeks for the Fire Marshall’s Office to complete its final report.

Read the entire announcement here.