Federal, state and local investigators are trying to determine what caused a massive explosion that killed two people, injured seven, damaged or destroyed 31 homes and forced 200 people from their homes late Saturday night, the Indianapolis Star reports. 
While the cause is unknown, much of the attention is on natural gas lines that have since been shut down.
Citizens Energy said it wasn’t clear Sunday whether a gas leak could have caused the explosion, the Indianapolis Star reported.
Indiana has a painful past with gas explosions. The deadliest disaster in Indianapolis history was a gas explosion that killed 74 people and injured 400 others after it tore through the State Fairgrounds Coliseum on Halloween 1963, according to the Star.
It’s unclear which federal agencies are involved.
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