Officials say natural gas is a possibility for the Tuesday morning explosion that killed two and injured three others, but say other gases could be to blame.
Some gas stations in Indiana are selling gas for as low as $1.30 a gallon.
Analysts say Indiana is among the states with the most volatile gas prices.
The price of gas trickled back down just before Christmas after a spike last week, but now that the holiday has come and gone, the price has jumped even higher.
A coal to natural gas plant that could be built in Rockport is in the hands of the Indiana Supreme Court.
A Purdue University professor predicts higher production and lower demand will lead to lower gas prices this summer compared to last.
Eligible residents will receive a $290 dollar credit on their winter electric or gas bill.
The Indiana Department of Natural Resources is collecting information on chemicals used in hydraulic fracturing.
Gas prices were significantly lower during Fourth of July this year than they were last year.
Many retailers have been losing money while trying to avoid breaking through the four-bucks-a-gallon mark.