What turned a neighborhood into a charred pile of rubble?  They still don't know in Indianapolis, days after Saturday night's deadly explosion.

FOX News Radio's Jennifer Keiper has more:

Audio clip:

Investigators have ruled out a plane crash, a bomb or a meth lab as the source of the explosion in an Indianapolis subdivision, and there's no sign there was a gas leak.  Two people were killed.

At a candlelight vigil for second grade teacher Jennifer Longworth and her husband:

(Parents & Student) "She just loved her job.  She was good with all of the kids, and just did an excellent job."//"She was quiet and she would always read stories."//"It's just so tragic.  It's such a senseless loss."

Officials say as many as 31 homes have been so badly damaged in the blast they may have to be demolished.

Jennifer Keiper, FOX News Radio.

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