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The explosion in a quiet suburb of Indianapolis that killed two people and severely damaged dozens of homes last week was no accident. Local Homeland Security officials, along with the ATF, admitted as much on Monday night when they announced that they'd opened a criminal homicide investigation into the incident. Before you jump to any conclusions, though, there's been no mention of big words like "terrorist" or "attack." So far, the very mysterious case of the exploding subdivision appears to be a case of arson gone wrong.

At the center of the investigation is a white van that was spotted in the Richmond Hills subdivision just outside of Indianapolis on November 10, the day of the attack. Authorities are in search of any clues about what the suspicious van -- when are vans not suspicious? -- and are offering up rewards ranging from $1,000 to $10,000 to any information that leads to a conviction. In the meantime, the investigation has been focused on the home of Monserrate Shirley, whose house is believed to be the origin of the explosion. The story was already scary when we thought it was an accident. Now that it looks like an intentional act, we're simply petrified.