Natural Gas was the culprit in an explosion that rocked a Calhoun community last Thursday.  The GBI along with local authorities investigated the cause of the explosion that leveled one home and caused damage to several others in the Saddle Brook community in Calhoun last week.  Authorities said on Monday that a natural gas leak caused the explosion, no one was at home in the house that was leveled at the time of the blast and their were no injuries reported in the neighborhood.