Investigators say they believe a home that exploded in Indianapolis, killing two people who lived next door, was intentionally filled with gas. The massive blast leveled 5 homes and damaged at least 80 more. 

Police announced yesterday they were investigating the explosion as a homicide.

The Indianapolis Star reports two people were questioned yesterday, but they were not arrested. 

Police also found the white van neighbors had reported seeing in the area leading up to the explosion, but they're not offering any other details.