Transcript for Indianapolis Blast Now a Criminal Investigation
In Indianapolis that leveled two homes last week the police now say the explosion was intentional. Treating the -- is a criminal homicide we get ABC's senior justice correspondent Pierre Thomas for the details. The aftermath looked like a war zone houses ripped apart in the massive explosion the police initially thought was a horrible accident. The house -- things Allen -- outside. We deceive the whole house music. Barbara -- house stopped us and it was completely often planes. But tonight authorities are releasing new details suggesting the natural gas explosion that left two people dead. May have been murder based on those interviews and the results of the search warrants we can confirm tonight. That -- an active homicide investigation in this matter there have been reports of a white van near the home before the explosion. Police have been conducting interviews and searching homes in connection with the tragedy. Specifically. If anyone has information about a white band. Seeing in the subdivision on the day of the explosion. And about the occupants of the -- we urge you to contact crime stoppers crime stoppers is offering a 1000 dollar reward for information leading to an arrest. In this case. Special agent in charge Robin Shoemaker of the federal alcohol tobacco and firearms has authorized to reward of up to 101000 dollars. 34 year old John longworth and his wife Jennifer were killed in the explosions that leveled two homes and severely damaged dozens more. Today I would to hear about us. And during that mess. I was have a trouble. There myself coming to a sense of peace and reconciliation. I cannot even imagine what the families are going through. If I could not. Tonight it's unclear what the motive we have been -- such a horrific crime. And police would not say if they have identified specific suspects. Neighbors left behind are stunned wondering who could do such a thing. And worried it might happen again. Pierre Thomas ABC news Washington.
This transcript has been automatically generated and may not be 100% accurate.