no-fly zone was ordered over the area, as emergency workers feared that propane tankers parked on the site might spark further explosions, although those fears were diminishing by noon.
Natural gas and hydro were shut off to the area as a precaution.
The first explosion, which could be heard seven kilometres away, shook nearby homes and buildings, waking residents.
Robert Halman, who lives on Murray Road, said his ceiling crashed on top of him, and the doors and windows of his home blew out. Flames were everywhere, with fireballs exploding into the sky.
He escaped, but his shirt caught fire, burning his back. His forehead was covered in blood from the debris that hit him.
"I'm lucky that I got out of there alive," he said, scratches visible on his forehead.
Reports also emerged that callers trying to reach 911 at the height of the explosion were getting a busy signal, but Miller would not comment on those reports.
He also said it was too soon to investigate whether the propane facility should have been located in a residential neighbourhood, a concern many area residents have voiced. The facility was allowed under zoning laws, and regularly inspected by the province.
Shelley Carroll, Toronto's acting deputy mayor, suggested Sunday that the propane depot was in place before many of the area homes were built.