so according to authorities, it's still a mystery.

TODAY | Aired on November 12, 2012
Police probe mystery Indiana explosion
An Indianapolis neighborhood is still off limits while police try to figure what caused a horrific explosion that killed two people and prompted nearly 200 residents to flee their homes. NBC’s Ron Allen [link to video.today.msnbc.msn.com]

people felt this 67 miles away, in other counties. people falling sick miles away. um...