Assistant Montgomery County Police Chief Russ Hamill said at a news conference that two people are confirmed dead but have not yet been identified. He said the two people were located in the ruins of the building.
Hamill also said three firefighters with minor injuries were among 34 people taken to local hospitals after the blaze, and were released today.
Firefighters were called to the four-story apartment complex just before midnight yesterday and found people on upper floors who needed help, Montgomery County Fire Chief Scott Goldstein said at a briefing.
"People were dropping children and jumping out of other windows," Goldstein said. "Everybody was getting out of the building as rapidly as possible."
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Goldstein said natural gas furnaces and stoves are in each of the units. It took at least an hour and 45 minutes to put out the blaze and Washington Gas helped safely turn off gas, he said.
Paul Carden, regional disaster director for the American Red Cross, estimated that 100 people were displaced, and 60 or 70 were staying at a Red Cross shelter established at a nearby community center.
Carden said those displaced are primarily Spanish speakers. Translators were being brought in to ease communication.
He said the nature of the explosion has been especially traumatic.
"To basically be in an event where people were blown out of their of beds ... And what they own is lying across the street, that's a key difference" from a typical fire evacuation, he said.