INDIANAPOLIS (WISH) - ATF agents spoke Thursday morning about the role they are playing in the investigation of Saturday's massive warehouse fire.
Special agent Peter O'Connor likened the work to peeling back the layers of an onion.
"We first examine the outer layer for evidence of the origin and cause of the fire then we remove a layer of debris, examine that layer and continue on until they believe they found the origin of the fire" said O'Connor.
Because of the sheer size of the warehouse fire, fire officials in Indianapolis decided to call in experts with the ATF to aid in the investigation.
The ATF sent its National Response Team, or NRT.
The team includes fire investigators who have additional training and experience when it comes managing and investigating large fires.
"We also have as part of the team a chemist from one of our national labs comes on every activation and we have a fire protection engineer and an electrical engineer that responds with the team as a component of our fire research lab as part of the team" said O'Connor.
Part of the team includes a K-9 trained to detect accelerants. The ATF would not comment on any specific aspect of the investigation Thursday.
Agent O'Connor says the air quality in the area is good based on the latest testing.
Earlier this week, IDEM detected levels of asbestos in the air.
Because there is asbestos in the warehouse, investigators are wearing protective suits and respirators.
A winter weather advisory is in effect for Central Indiana through Friday night. Southern counties will be under a winter storm warning beginning Thursday night through Friday night.
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