The Aug. 10 explosion in Northwest Baltimore that killed two people, injured seven and reduced three rowhomes to rubble was due to a “large natural gas buildup” ignited by a stove, city officials said Tuesday morning.

“Based on the investigation and evidence, it appears as though a stove was turned on, which provided the ignition source” at 4232 Labyrinth Rd, Fire Chief Niles Ford said.

He said a licensed contractor did HVAC work at the address the day before the explosion, but investigators did not find proper permits for their work.

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