INDIANAPOLIS -- Investigators say they have narrowed down the cause of a deadly home explosion to a faulty appliance.

The blast killed two people and left hundreds of others homeless.

Despite the hardship, neighbors and first responders are proud of the community response in the wake of the tragedy.

"Most of them come. They're not trying to be heroic," said Captain Rita Burris of the Indianapolis Fire Department. "They just want to help do something. So it just really reiterates the fact that Hoosier hospitality and compassion is alive and well in Indianapolis."

Investigators are trying to recover appliances from inside the destroyed homes.

One of the houses reportedly had an issue with their furnace in the days leading up to the explosions.