SEWARD COUNTY -The Kansas State Fire Marshal continues their investigation into the cause of the January 13, explosion and fire at Groendyke Transportation southwest of Liberal, according to Seward County Fire Chief Andrew Barkley.

A tanker truck and three employees were inside a large wash bay at the time of the explosion. The tank trailer was not loaded and was being externally washed. Its last contents were condensate, a natural gas processing byproduct, according to a corporate media release.

The three employees were flown to St. Francis Hospital in Wichita hospital and remain in critical but stable condition with burns, according to Barkley. A fourth employee was treated for minor injuries.

Groendyke’s terminal’s parking lot remains open but office operations have been moved temporarily to the Trinity Church on Kansas Avenue while cleanup of the at the location is completed, according to Barkley.