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The Ontario Fire Marshal's office spent much of Tuesday combing through the debris where the home stood near Brimley Road and Steeles Avenue East.
Yesterday investigators said despite the massive explosion, there was little fire damage, which indicates the explosion was caused by a "volatile, ignitable" fuel.
Officials called the explosion a case of "stoichiometric combustion," which means an explosion where the combustible fuel is burned completely.
"We're looking for migrant gases — is it possible that we have migrant gases that have come through the soil and into the basement," said Wayne Romaine of the Ontario Fire Marshal's office.
The body of a man was pulled from the rubble near the rear of the house on Monday. He has been identified as Paul Zigomanis.
The blast also damaged more than a dozen homes located near the blast site.