An aerial view on Sunday of two homes leveled after an explosion on the Southeastside of Indianapolis. The blast late Saturday night damaged homes and led to the evacuation of residents. Matt Kryger/The Indianapolis Star from WTHR Chopper 13

(Indianapolis, Ind.) - The search for answers continues today after an explosion rocked Indianapolis' southeast side over the weekend, killing two people and injuring several more. 

Authorities are still trying to determine what caused the explosion which decimated two houses located next to each other and nearly laid waste to much of a densely-populated neighborhood late Saturday night. The explosion was so loud it could be heard from miles away and doors and windows from homes a block or two away were blown out. 

The Bureau of Alcohol, Tobacco, Firearms and Explosives has been called in to help with the investigation. 

Damage from Saturday's blast is estimated to be $3.6 million. Officials say more than 30 homes may have to be demolished.  Public Safety Director Troy Riggs said those affected by the explosion will be helped.

“We’re going to use every resource to help individuals get their lives back in order,” said Riggs.

While authorities have not released the names of the two people killed in the blast, a vigil was held Sunday for a teacher and her husband at Greenwood’s Southwest Elementary School. Second-grade teacher Jennifer Longworth and husband John Dion Longworth lived at one of the two destroyed homes.

Riggs praised the emergency responders who helped with what he says is the worst disaster he's ever seen. 

“They did not know what they were walking into. They didn’t know if they had the equipment for this or what had occurred. They just knew that citizens needed help and they showed up,” Riggs said.